its a shortened version of the old cockney rhyming slang Bangers and mash .... Cash

but in the more modern another way we use bangers as a way of expressing got lots of cash.

an ecstasy tablet, e, x, yoke etc. especially in Waterford and some other parts of southern Ireland

a girl with an attractive body

scottish word. a derrogative term.

tricks with finesse and style

a potentially dangerous or illegal situation involving sex

a person who is a very good and very strong fighter