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1.
Versatile slang connotating a person who sucks in some form or fashion, be it sexual in nature or un.

Can also be used as a verb, in a nonsuperlative manner, i.e. donkey chonk.
Ralph: Hey Johnny, check out the guy with the toilet roll hangin' out the back of his pants.
Johnny: Yeah, what a donkey chonker.
by King Sexy October 15, 2005