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1.
The opposite of a pro-stitute, which is a hook who is a pro.

A cuntstitute is a hooker which is not a pro, and very amateur like and rude, thus, deriving the prefix cunt.

BOB: Eh Greg, know any good prostitutes 'round here?
GREG: Dangnamit, I only know them cuntstitutes 'round here.
by El Grandez November 16, 2007