So I know I've seen this discussed, debated, and investigated with various song titles by various members over the years ... Brain Center springs to mind. Not sure if there was an actual thread or just discussion about this in others ... last night I came across one ... and so now, volia! Origin of Melvins Song Titles Thread.
Rat Faced Granny - In Drugstore Cowboy David (Max Perlich's character) is at the door of Bob's (Matt Dillon) place. Bob asks him if he's alone ... David replies "No, I brought my Ratfaced Granny along".