Top Definition
a sly, cunning person that uses his ways a lot to con or brainwash someone to do what he wants. this person is the opposite of a gwapper
did you see the way that dude tricked that girl into hooking up with him? what a freaking greesper man!

dude you are greesping hard right now. ive never seen anyone greesp this hard in my life.
by MikeyDoo01 July 05, 2011
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