To demasturbate, you must quickly let go of your dick before ejaculation, this will slowly flatten the erection and make it difficult to use your bladder.
Guy 1: Dude did you demasturbate about that girl.
Guy 2: Yea, it took me centuries for my piss to let loose.
Guy 3: What the fuck man?
Putting the cum back into a person’s sexual organ
“Jimmy what are you doing?” Jimmy proceeded to do as the definition above states to Steve “I am going to Demasturbate you Jimmy”