The process of going out with an attractive girl, making her your girlfriend, making her fat and ugly, then breaking up with her. This probably needs to be done by a fairly attractive and rich man. To frump the girl, he would need to get them to eat more but workout less.
"Man that hottie is such a bitch. I'm going to frump and dump her to teach her a lesson"
"Frumpy Dumpkins" is a generic name used to describe the "ugly girl" that wants to be hot in any society. "Frumpy" is used to describe her fugly, lumpy, or bumpy self while "dumpkins" is implying that she is the type of girl you'd dump or find in a dump.
There also used to be a clothing line at frumpdumpkins.com that is stylish clothing for the not so stylish female.
"Look Zach is hanging around ole Frumpy Dumpkins over there in the quad."
I got my new shirt at Frumpy Dumpkins house last Wednesday!
That girl is a lil frumpy & a lil dumpy so she is Frumpy Dumpkins.
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.