Top Definition
A sad disease that is uncurable. It causes you to hunt grenades, a fat species of women. If around someone with Grenitis for too long, you may catch it, but you can get rid of it if you apply purel shortly after contact with the infected person. If you do get it, you will get some sort of blemish on your face for the world to see. It will go away if you are cautious and use a lot of purel. If you are born with it, though, it is uncurable.
Guy:"Oh shit look at that fat ass grenade over there!"
Will Carroll:"Where? I only see a hot babe."
Guy:"Crap! He has Grenitis!" (Applies purel and runs away)
by Doctor Bob the -itis expert February 07, 2011
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