To thoroughly wash your hands for at least 20s to minimise the spread of covid-19.
Oi bruv, you'd better go kweff your hands, you don't wanna catch the 'vid!
4👍 47👎
To beat someone up, or attack them harshly.
Bro, if you saw the way that I kweffed that opp boy yute, man wouldn't be surprised if his broski left him.
26👍 4👎