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Knuckle Dumpster 

Someone who enjoys another person's fist being put into their body, especially used to describe homosexuals.
Dude #1: Portia De Rossi is redonkulously hot...
Dude #2: Nah, she is just Ellen's Knuckle dumpster.
Dude #1: That's a damn shame.

knucklebumped a floater 

when one's aggressive ass-wiping causes him or her to forcefully strike the chocolaty log within the toilet bowl.
i was taking a behemoth dump on my break before i looked at my phone and saw that i had only one minute 'til punch in time. i was wiping so aggressively/quickly that i, accidentally, knucklebumped a floater.

Knuckledump 

The term used to describe masturbating in a porta-shitter while in the field.
PVT 1: "Dude, we need to go back to the rear so I can get laid!"

PVT 2: "Why don't you just go to the shitter and take a knuckledump?
Knuckledump by SGT JPB January 5, 2011

knucklebump 

knucklebump all up in this whoa!
knucklebump by faggymcfaggerton November 26, 2010