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1.
A ransack of one's asshole so extremely deep and hard that bum crumbs and ass debris are scattered about the area. After a butt hammer one's asshole can only be described as ass dough.
1st guy:Dude, why is your girlfriend limping?
2nd guy:After a butt hammer no one walks straight
by Brgr23 May 23, 2008
 
2.
when a particular individual laks the self awarness to complete a wipe, leaving small particles of poop clinging on the the tendriles of hair on the inside ones butt cheeks.
I wish i would have spent more time on the wipe, ive got a massive set of butt hammers right now.
by jonny lyford August 15, 2007