nimshifter 

Chuck calls you this when he's otherwise speechless.

I told Chuck his DSL modem couldn't possibly be dialing a number and he got mad and said I was a nimshifter.

nimshifter by Homer Loves Donuts July 26, 2008

Nipshitter 

One who shits on other's nipples.

Juan is such a nipshitter.

Nipshitter by The Bassett Hound January 19, 2014