Top definition
The state in which a sudden and immediate erection arises, so unexpectedly and quickly that chodal whiplash is not uncommon
Boy 1: Dude, how'd you break your nose?
Boy 2: I saw Ellen Henson, damn that woman is so hot that I got a massive insta-bone and it sprung up right in my face.
by Tolley August 27, 2003
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3
1) A word for a phenomonally hot male

2)A word for the feeling you get when you see the aforementioned male.

3)A comical sighting of a male erection at an inopportune time.
Holy crap look at that instabone!

Todd gave me an instabone (female saying this)
by Michael Carrier July 27, 2004
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