“Big Momma’s House” makes a severe error in judgment by assuming that, when slim men dress in drag in comedies, playing overweight women in their twilight years is the compulsory approach. This plunge has already seen more than its fair share of interpretations in the cinema, and as such, has become a tired and clichéd instrument of movie making. The idea was most recently milked to death by comedies such as “Mrs. Doubtfire” and “The Nutty Professor,” but those films, at least, are ambitious in certain ways. The filmmakers behind “Big Momma’s House” seem to only have one desire in mind: to trap an actor in an oversized body suit, have him wander around and, ever so often, shout out insipid dialogue to see if moviegoers’ interest will last long in the less-than-amusing transformation.