Bloody knuckle

The sexual act of cutting ones knuckle (2-3) and putting their fist in their partners vagina or anus to "claim dominance"

Heath: why are your knuckles cut
Avery: oh... Let's just say I gave my girlfriend a bloody knuckle
Heath:oh my God dude,why?

Five Finger Death Punch

When a person soaks their fingers in the spiciest sauce they can find,then proceed to put all five soaked fingers in an orifice of the said person's partner.

Guy 1: yo, why are your fingers reddish?
Guy 2: my boyfriend wanted a "Five Finger Death Punch"
Guy 1: Jesus, Is he okay!