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Someone who is so incredibly sexy, that they make you instantaniously nut your self, otherwise known as an insta-nut
Damn, that girl was such an insta-nut
by leeper July 07, 2006
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Instanut (in-sta-nut) is the term used when someone or something is so aroused, usually by a person or situation that they would then instantaneously ejaculate or in other words "nut".
Example 1:

man 1- wow did you see Jessica's ass
man-2 - ya dude that was an instanut

Example 2:
That pornography was so hot that i instanuted
by PcProcrastinator May 26, 2018
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