Definition & Meaning of "wagwan"in English

What does "wagwan" mean in British slang?

The structure is a contracted, rapid pronunciation of "what's going on?" or "what's happening?" from Jamaican patois, reduced to a single word. It is used in British Multicultural London English (MLE) and UK slang as a greeting to ask how someone is doing or what is happening, similar to "what's up?" or "how's it going?" People typically say "Wagwan, bruv?" or just "Wagwan" as a casual hello.