Gwan is a Pattwa' word, It is mainly a Jamaican term. It can mean two things to *go away or *what is going on

Guyanese word for "going on"

British term used as slang for cannabis.

A term used to describe the feeling you get after smoking marijuana and can also be used to refer to the ganja itself.

idiom: going on

slang from Cork city in Ireland - short for "go on". The term made it's made to the Carribean while Irish slaves were shipped there in the 16th and 17th centuries. Slang Irish terms like this then made their way into the Carribean "patois", particularly Jamaica, where "gwan" is pronounced and used in exactly the same way as in Cork city in Ireland.

Alternative for "happening", often used when expressing confusion.