Derived from the adjective facetious which means "treating serious issues with deliberatelyinappropriate humor; flippant" penistious is treating any issues in a penis-like manner with deliberately acting like a dick.
That politician was really being penistious during the debate. It is very penistious to say 'it is what it is.'
A sassy black woman who is known to be quiet and yet an extremely sweet person. Everyone listens to her when she speaks because what she is saying is intensly wise. She will make a wonderful orientation leader.