Soap Dispenser

Usually performed alone when extremely bored, curious and/or mentally challenged. 'Soap Dispenser' is the act of a man or woman deciding to lie on their back with their ass against the wall, then vigorously masturbating until climax. They will then proceed to wipe their cum all over their face.

Me: "Why didn't Elena come into work today?"
Luke: "She walked in on her step-son doing the soap dispenser and nobody's heard from her for days."