Painterbation 

The act of dipping your penis into paint and slapping it against a blank canvas, thus creating an art piece.

C: Hey, have you seen Q's abstract art work
E: Yeah, I think its called painterbation

Painterbation by Scootch, Slooter and Q December 31, 2010

Painterbation 

An abstract painting made with repeated brush strokes, drips, pours, and/or splatters, resulting in a self-indulgent, overworked mess.

That Jackson Pollock was a real master of painterbation.

Painterbation by aliencockdock December 5, 2022