n. near inevitable romantic relationship arising out of the sex-hungry state created by vacation
Instant Romance: just add summer camp.
Guy: Man I can't get a girl friend
Wise Man: No problem, go to that summer camp your parents are trying to send you to.
Guy: But it's a church camp and I'm a virgin.
Wise Man: Perfect! Religion, repression and tents make the perfect conditions for an instamance.
Guy 1: You still talking to that blonde you met on the cruise ship?
Guy 2: Tropical instamance is especially strong.
I think Danny and Sandy from Grease is my favorite instamance.