Two hand slam is the act of pleasuring ones self with both hands vigorously. Commonly done by males with an average penis size to make them think it's bigger than it actually is. If one is fortunate enough to receive said two hand slam it will be a very memorable experience and cause you to only pleasure yourself with it from here on out
Guy 1: Man, both of my forearms are super sore

Guy 2: Bro, it's gotta be from all the jerking off

Guy 1: No its not that...
Guy 2: Once you get used to the two hand slam your forearms won't hurt anymore. Trust me
by Two hand slammer October 10, 2017
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