When one goes to take a shower with the intention of both showering for the sake of showering, and also using the opportunity to masturbate.
Dude, I could hear Josh in there. He totally ditched us to showerbate.
by Xiwt March 09, 2012
The Act of furious Masturbating during a shower
Damn Showerbating isnt funny anymore
by Wilitus July 12, 2005