Top Definition
A sex position that involves three men. The first one bends over, the second man the proceeds to place his erect penis in front of the first man's asshole. After that the third man uses his penis as a hammer to slap the second man on the ass until the second man penetrates the first one.
Bob: Hey dude what was that slapping noise coming from your room last night?
Jon: Oh me, Charles and George were doing a dirty hammer.
Bob: Awesome!
by makeaRonie August 20, 2014
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