When something so spectacularly amazing happens that you just can't possibly control yourself. Pure euphoria, in essence.
Waking up to that text message AND Lady Gaga was just too much. It was instajizz.
by Wadeski December 10, 2009
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When something so incredible happens that you lose control and instantly jizz your pants
Person 1: "Dude when i turned that corner and saw that Taylor Swift poster i Instajizzed"

Person 2: "Yeah because she is Taylor Swift!"
by Sebastien Carson September 6, 2011
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Where a man jumps from an airplane with no parachute, masturbating during his decent until he lands with his erect penis inside a hot chick's vagina. They both die, then the man jizzes inside her snatch.
The last thing I want to do before I die is do a Skydiving Instajizz.
by harrison ford July 30, 2014
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