A type of boxing/street fighting with no padding. Both the knuckles and face bleed, so blood gets from fists to face and vice-versa. There is not an obvious winner since both persons involved are seriously injured on at least one part of their body. However, the person last conscious is usually considered the victor
X: I got in a bloody knuckle fight. My hands are all cut, one of my hands is broken, and so are three fingers on my other hand. Also I got punched in the face that gave me a black eye, and almost ko'd me.
Y: Damn, sounds brutal. You win?

X: Who knows. Both of our hands and faces were messed up and we were both punch drunk

Ex2:
X: I won a bloody knuckle fight with one hit, although that broke my hand
Y: you k.o.'d him with one hit!?
X: yeah, but my hand is shattered my hitting him in the face.
by Darksoul538635375935 December 31, 2016
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The act of fisting or punching a girls vagina during her period
emma- my man bloody knuckled me so hard last night
Darla- girl you a freak
by tdagreat April 3, 2018
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