Green’s Dictionary of Slang

kuff n.

[SE cuff]

(UK black) a blow, lit. or fig.

[UK](con. 1979–80) A. Wheatle Brixton Rock (2004) 155: It was only now that she experienced the first kuffs of guilt.
[UK]A. Wheatle Crongton Knights 12: You’re asking for a kuff in your freaking eardrums.