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1.
To unlock a door with a magnetic card lock, without first removing the card from your wallet, or the wallet from your back pocket.
Nobody was around, and I was in a hurry, so I just butthumped the server room door open.
by vertigo23 April 19, 2009
 
2.
a (not so) endearing term used to describe a friend who is very perverted, and makes lots of sexual jokes all the time. similar to a 'butt munch'.
"Billy is being such a butt hump today!"

"Stop being such a butt hump!"

"Yo, stop butt humpin', bro!"
by SomeoneWithAnAwesomePseudonym! February 22, 2010