very similar to ANB. when such an unbelievably attractive female comes into sight, even the peripherals, your boxers instantly fill with semen. there is no way to prevent this. like ANB, INB is typically an extremely sarcastic joke for the ugliest women alive.
Oliver: "The floor is shaking, Kimberlyn must be coming"
Mark: "Don't look! You will bust multiple nuts!"
Kevin: "Shit...I couldn't help myself. I just had to look at that fine ass INB."
by WeinerRedeemer December 14, 2009
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I need bud ; A person in need of or that desires marijuana bud.
Nelson texted me INB because he had run out of his own stash.
by Puffmumma January 21, 2019
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A shortened version of "I'm not bothered."
girl1: ooh look, your ex-boyfriends over there.

girl2: excuse me, INB.
by Livii August 8, 2007
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Pretty much torture in the science classroom. A way of making students think they will be doing a science experiment, when in reality it is a stupid online "lab"
Sally: What are we doing in science class?
Sam: An INB
Sally: Dammit that sucks
by MrStripes October 7, 2021
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