A mushroom shaped boil/wart on ones rump(ass). Known to puss and emmit other liquids causing the owner immense pain and suffering.
"OMFG did you the size of that guys mushrump?"
to tell someone you are reading is the code for wanking. this is appropriate as no one really reads anymore, so it's unlikely to get mistaken.
dude1: hey man, what's up?
dude2: fuck off i'm reading!
dude1: awh dude!
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