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knuckle-up 

An action akin to the high-five or the handshake. The act of touching fists knukle-to-knuckle in greeting or departure. In 2003 this action was accompanied by the phrase "knuckle-up" but has since just become the motion without the phrase. The first instance of this action and phrase was in Dallas, TX in the mid-90's and has since become a common gesture in most public forms of transit in NYC.
Jimbo-- "Is that some kind of a gang sign?"
Miguel--"Nah, that's a knuckle-up, bro."
knuckle-up by super steve September 11, 2005

knuckle dunking 

Not to be confused with finger fucking , knuckle dunking is abit more gentle and must be done an hour or less after dunking powered mini donuts in milk.
Was knuckle dunking for so long my wrist hurts dnd now I have no more mini doughnuts and milk
knuckle dunking by BSR710 March 6, 2018

Popping your butt knuckle 

Farting or getting raped in the ass by a large shemale.
Dude that one website you sent me to last night was digusting, I didn't know shemales could be Popping your butt knuckle.
Popping your butt knuckle by UF Omega September 13, 2011

knuckle dragger 

A mechanic or engineer who frequently uses hand tools that require rubbing there hands against objects .
man 1 : hey man is your car fixed yet ?

man 2 : nah , man . those Knuckle draggers are taking all week .
knuckle dragger by MassDemo August 1, 2012

double knuckle shuffle 

Two fisted knuckle shuffle.
Whoa! I just walked in there and Billy was doing the double knuckle shuffle on the piss pump!

monkey knuckle 

monkey knuckle by Mike! June 8, 2004