Define Knuckle Up Meaning

a phrase uttered in encouragement meaning: "muster your courage, intestinal fortitude and love for the American-way in preparation for an upcoming (or admist a) challenge
of epic proportions!"
(uttered many times by one of the dudes in the movie "The Matrixs:Revolutions" during battle
against the electro-mechanical foe)

to prepare to fight.

TO Put Up YOUR Setz And get ready to fight

To prepare to kick another's ass, getting prepared to engage in fisticuffs

To Make Reddy, To Make Preparation, To Assemble, To Focus on the objective, To concentrate

major shrinkage of a man's penis to the size of a finger between two knuckles

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.

The Act Of Whupping Someone's Ass!

To masturbate
The act of masturbation

To get belligerently drunk, to the point of blacking out and making choices you may regret