Green’s Dictionary of Slang

cuff v.1

[SE cuff, to strike with the fist; note Rötwelsch (Ger. rogues’ cant) kuffen, to thrash]

1. [late 19C+] (US black) to hit, to fight.

2. [2000s] to defeat (in a competition).

SE in slang uses

In phrases

cuff Jonas (v.) (also knock Anthony) [SE cuff, to strike + generic use of Anthony/Jonas, a person, oneself] [late 18C–early 19C]

1. of one’s knees, to knock together.

2. to strike the hands under the armpits to warm them.