As I said, I'm not British, so the definitions listed are based on my research, as well as the knowledge I gained from British TikTok. If I missed any words, or if any of these definitions are inaccurate, please let me know in the comments! Thanks!
Allow it: To stop doing something or leave something alone
Bait: Obvious and annoying.
Bruv: Used between men to address one another. Also used by women in certain circumstances.
Bare: Really/A lot (flexible with context).
Buki: Strange or weird.
Bunda: Rear-end.
Blud: Friend or associate.
Chirps: To chat someone up.
Clapped: Less than attractive.
Cweet One: An attractive woman
Dench: A good/attractive person/thing.
Dinghed: Somone who is stupid/foolish.
Egghed: Opposite of Dinghed
Fam: Put at the end of a sentence to address someone.
Garms: Clothing.
Geezer: A man, positive or negative context.
G: A person.
Long: Will take ages to complete.
Leng: Super attractive.
Mandem: A man's group of friends.
Nang: Something is good.
Owned: To dominate.
Opps: Opposition.
Peng: Attractive, but to a lesser extent than Leng.
Peak: Used to describe a situation that is good or bad, mostly the prior.
Rahh: Used to describe a state of shock.
Safe: Something that is good or cool.
Ting: Thing.
Vexed: Angry.
Wasteman: Someone who is being foolish or annoying.
Wagwhan: What's up?
Yute: Someone you don't like.