pithium 

an element essential to a person's sense of humour

My friend Dave Letterman was diagnosed with a low pithium count. we wish him a speedy recovery and may his jokes improve

pithium by markokenya November 3, 2014

Pithism 

A short curt statement cleverly designed to get under a person's skin.

Your pithism has no teeth in it. If you don't quit lisping, you are really going to piss me off.

Pithism by Blue Ridge Bubba August 26, 2009