Sexual move in which a male pulls out his penis after anal sex and performs a mushroom stamp (hammers dick on partner's forehead) leaving an oily stamp.
JJ: Dude what's the deal with joey's forehead?
Adrian: oh he got an oily hammer from jackson last night.
Adrian: oh he got an oily hammer from jackson last night.
by blizard29 May 8, 2009
Get the Oily hammermug.