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Someone who is so grotesquely disgusting they aren't even worth the energy to rape.
Allan - Hey man, did you see that lady?

Brent - That bitch is Unrapeable.
by 7O01 February 08, 2012
Someone who is so gross, so disgusting, that he/she is not even worth raping. Someone who is repulsive, and whose genitalia is questionable even though they are a virgin.
Rory: Man, have you seen that Anna chick?

Steve: Yeah, dude; she's unrapeable.
by lalaloopsy12 March 10, 2014