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An invitation to get raped. Generally, in the form of one that is willing to be raped, but not always the case.
"The girl passed out naked on her hands and knees, that's a rapevitation if I ever saw one!"

"I'm going to pass out with my rack out" (the statement is a rapeitation)

"Somebody please just fucking rape me until I pass out."
by The Real Shatter May 11, 2010