Top Definition
When a co-worker gives you a name that you absolutely hate. Then other co-workers join in on the fun until it gets posted on Urban Dictionary.
Hey J-Nasty, can I borrow the key to go get nuggets?
by McSpiceDrop July 06, 2011
Is a disgusting thing that doesn't know the meaning of cleanliness and upkeep; believes that field day, is the only day that week he has to keep the room clean.
Cpl.= Damn it Jnasty (Johnson) there is a pancake stuck to the glass plate in the microwave.

Jnasty= wasn't me!
by Sleeping Sheep August 24, 2008

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