Top Definition
An adjective that describes sonething that is crappy. Another word for jank, crap, or stupid. Comes in the form of "gwumpy", "gwumpish", "gwumping", or "gwumped".
1. Damn. The movie is sold out. Thats gwump.
2. That girl is so gwumpy all the time.
3. Bobby: "Im gonna fail this test! Im gonna fail high school and die." Tom: "Shut the hell up! And stop being so gwumpish around me!"
by Daddy Fat Fish July 20, 2010
The sound of a female breast hitting your arm.

The act of a breast hitting your arm.
Dude, she totally gwumped me.
by Sincomatt November 06, 2008
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