1) one who masterbates to much
2) a general dickhead
derived from chub and thump.

(thumping ones chub)

Stan: This herb Lopez fronted me is full of seeds and stems!

Joe: What a chubthumper
by grimsweeper January 17, 2004
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It's when you have sex with an overweight chick
Merlin: "Hey did you get any last night?"
Melvin: "Yeah, I banged gretchen last night."
Merlin: "Dude, you were chubthumping."
by Egore The Magnificient August 4, 2008
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