a word that one says when something is vulger, disgusting, or just downright gross.
Person 1: I just heard bout this guy that eats his buggers all the time.

Person 2: Oh, that's nasters!
by Mcgee and Me December 10, 2008
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Someone who does not wipe or wash their hands after fisting a bunghole.
He refused to wash his hands after fisting my now elongated bunghole. Whatta knuck naster.
by TJT FIEND May 29, 2009
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The amount of nasty something contains.
I don't go on Omegel. I try to avoid the Nasterity level as much as possible.
I was in THAT part of youtube. Man the Nasterity was over 9000.
by ZebraBoxDinosaur September 12, 2012
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