It is when you mess with somebody to the point you make them want to shit out of their ears. They get so pissed they start eat their own ankles.
Jon: Hey Seth!

Seth: Yah Jon?
Jon:Yo titties look like some deformed grapes.
Seth: REEEEEEEEEEEEE
Jon: hah you have been nasch
by Mcglauflin March 14, 2019
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to spill your drink in a way that makes it look like you pissed your pants
Aww shit, i nasched on my fuckin pants again.
by Jake May 9, 2003
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