What does Ali G say?

It sounds like “boolah kashah.”

What’s he really saying?

TY!

Booyakasha

I think it is a nonsense catch phrase link
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Ali G himself, in an interview with spin.com

Could you translate your catchphrases “booyakasha” and “wagwaan”?

“Booyakasha” means “listen up rudeboi everytin irie whayaso lickylicky ya wangagot fifiman.” “Wagwaan” means “booyakasha.”

booyakasha: “listen up rudeboi everytin irie whayaso lickylicky ya wangagot fifiman.”*