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combination of words that, together, form a pretty disgusting interjection/insult.
why the hell do you have to be so bumnasty about this?

ah bumnasty!! i broke my bomberman figurine!
bumnasty by Bumnasty Burger January 20, 2005
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Burrnasty 

When you are getting a blow job, sitting down, grab the girls head a shove her nose in your ass crack. When you do that fart on her face.
I just burrnastied this dirty slut.
Burrnasty by Jon February 27, 2005