UK Slang is virtually its new language stemming from Jamacian words brought over by the Jamacian people in the Windrush generation. It changes a bit from place to place. I don't hear many people in London say certi. But I don't hear many people in liverpool say "Wagwan b
piff ting can I get ur digits". Common universal UK Slang words
Leng, Clapped, Wagwan, What you saying, Jokeman, Batty, Bunda, G, Cuz, More Time,
True Say, Ting, Fam, Blud, Meady, Mad, On God (ong),
Trus
Can't think of anymore on the spot.