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8.
(noun)
A punctuation mark used to denote a question.

(slang)
Used to refer to an extremely large and curvy ass. I'll leave to you to decide what the "dot" means....
Mark: "Dude, did you see Jasmine? Now that's a question mark!"
T.J.: "Yeah, I would totally wreck that shit"

by Armon Sanders October 10, 2007
 
9.
An oddly shaped penis, as distinguishable by its question mark shape.
I heard that kid has a funky question mark.
by Paccali November 12, 2002