a twit or muppet.
File this report, chumpstain!
by Larry King September 15, 2003
A person viewed as a loser or lame.
"That chump stain is a 24 year old virgin"
by DaveNutz August 22, 2003
A shit smear on your asscrack or in your drawers that includes a non-shit chunk. Said chunk can consist of chile seeds, any tree nut, undigested items (including paper, metal and wood), Capt'n Crunch and more. This does not include klingons.
I hate doing laundry because dad always has chumpstains in his underpants.

Dude, I went to eat Erin's pussy and the bitch had a gnar chumpstain! She must wipe from back to front.
by archscientist March 02, 2010

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