when having sex with a female as the man is about to ejaculate he removes his member and smacks it with incredible force using his penis as a hammer on the women's stomach or ass blowing his load all over her.
by ap12387 April 7, 2010
The state at which men try to develop superhero senses to hear, smell, feel, see, and possibly taste someone coming anywhere near five feet of the bedroom or bathroom door when masturbating.
Man, i totally went superhero hammerjack mode yesterday, my mom almost caught me bumpin the monkey!!!
by Albusdumbledore July 18, 2011