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1. The combination of letting off some steam with angry masturbation which ends with a mess of semen, hence steamen.

2. Literally the combination of anger/steam and sperm.
Joe: Man, I'm really pissed off right now
Mike: Go get some steamen out of your system
Joe: Ok, I'll see ya in 15.
Joe: I'm back
Mike: You got some steamen on your face.
by wondersack May 02, 2011