SE in slang uses
Pertaining to violence
[1970s] (US) a punch.
[1930s+] (US) a fist fight.
[1970s+] (US black) that point in a confrontation when a physical fight takes over from mere words.
[mid-18C] (US) physical violence, to be administered by the fists.
see knuckle sandwich under knuckle n.
[1990s+] to clench one’s fingers into a fist, preparatory to fighting or hitting.
[2000s] (S.Afr. gay) one who enjoys fisting n.
[1990s+] to interrupt.
1. [19C] of a woman, to caress a man’s penis.
2. [mid–late 19C] (Aus./N.Z.) to eat with one’s hands.
[20C+] to masturbate.