When was the last time an overbearing Jewish mother giving her schlemiel of a son a hard time about not being married was a major component of a big Hollywood film? This sort of routine used to pop up all the time in American comedy but pretty much has vanished in the rearview mirror since the heyday of Ruth Gordon. So to behold Streisand’s New York mom Joyce Brewster hectoring her homely visiting son Andrew (Rogen) about his myriad personal shortcomings is to revisit a musty mind-set that the minor updates in Dan Fogelman’s woeful script can’t begin to freshen up.

The early scenes of Andrew’s return from California to his childhood home are so embarrassing that you wonder if such impressive consistency can possibly be sustained. Andrew knows what he’s in for, but that still doesn’t help when Mom immediately starts in asking what happened to former girlfriends X, Y and Z, complaining that he went to UCLA just to get as far away from her as possible, pointing out that she hasn’t had a date since her husband’s long-ago death and then recommending that Andrew get therapy. Enough, already.

In an effort to connect with Andrew, Joyce unloads what she considers a bombshell of a secret: She actually had a boyfriend before she met her husband and loved him so much she named her only son after him. Considering it odd she never tried to look him up after his dad died, Andrew does research that reveals he’s an executive in San Francisco. With an ulterior motive in mind, he invites Mom to join him on a drive across the country, during which he’ll make stops in Virginia, Texas, Santa Fe and Las Vegas to hawk a nontoxic cleansing liquid product he has created to potential retailers.

These pitch sessions are desultory affairs — a salesman Andrew is not — and Joyce doesn’t help matters by hovering and carrying on in ways that scarcely help her son’s cause. To save a few bucks, she insists they rent a compact rather than an SUV, forcing them to share very close quarters as they listen to Jeffrey Eugenides’ gender-bending “Middlesex” on CD. The way Joyce gets excited about gift shops and free continental breakfasts at motels (where she insists they stay in one room to save more money), you’d think she’d never been out of New York before.

In terms of viewer relief from the constant haranguing, getting on the road held out the hope of changing scenery and a possible parade of lively supporting roles. Instead, we get process shots of the two leads crammed into the tiny car intercut with second unit coverage of highways and the countryside. They do get out of the car to look at the Grand Canyon, but after about five seconds, they decide they’ve seen enough and move on to Vegas, which Joyce actually likes.

The one stop that at least yields something different is at a Texas steakhouse, where anyone who can eat a 4 1/2-pound steak and all the trimmings in one hour gets it for free. Uncharacteristically, Joyce volunteers, launching a gorge-fest that at least presents the half-amusing spectacle of Streisand pigging out and wins Joyce an admirer in the form of a handsome older gent (the indisputably handsome Brett Cullen) who’d like to have her come up and see him sometime.

The climactic visit to San Francisco to track down Joyce’s former beau predictably plays on, and aims to stimulate, bittersweet emotions. At the same time, the easy-to-get point of the enterprise is to stress that the mother and son’s prolonged time together has forced them to break through their various barriers, grudges and expectations to arrive at a more honest satisfying relationship. Yep, that’ll do the trick every time.

The Guilt Trip provides heavy competition with director Anne Fletcher’s previous films (“Step Up, “27 Dresses,” ”The Proposal”) as to which is the most formulaic and conventional, but this one takes the cake for being the most visually unimaginative and clunky. Worse, even the most easy-to-please audiences will struggle to find more than a half-dozen laughs here, so bereft is the film of fresh comic ideas.

Rogen — who for some reason sports about a one-day’s grizzle of beard throughout — drastically underplays, probably realizing that, with Streisand emoting so broadly, it was the only way to go. For her part, some combination of cosmetic expertise, cinematic enhancement and natural endowment makes Streisand look more like she’s in her 50s than in her 70s, which is the actuality. Those who’ve always liked the singer-actress probably won’t mind her here; for the nonfan, this is not the film that will change your mind.

A retinue of terrific character actors could have greatly enlivened the proceedings, but Fogelman (“Cars,” ”Bolt,” ”Tangled,” ”Crazy, Stupid, Love”) didn’t write the parts for them.

“Guilt Trip,” a Paramount release, is rated PG-13 for language and some risque material. 95 minutes.