A dowdy female who is dull and unfashionable. Lacking neatness and style.
That girl is such a frumpadump in those crocs and sweatpants.
To dump a frump after a sexual encounter or an episode of hogging. The method by which a hogger or frumper gets away from a butterface, bagger or Cleveland Brown with whom he has slept or had sex.
Don hooked up with that skinny, ugly girl and went home with her. He got out of that quickly in the morning with a standard frumpadump move. He asked her to get him something to eat, and when she left the room, he climbed out the window and ran away.