In Wigan (UK) I was visiting the local 'chippie' (fish and chip shop) to get some lunch and a customer ordered "pie and chips and a dollop of pea wet"
In Bolton (UK)I found a new word for a certain type of bread rolls, they were referred to as 'tits'.
The first time I asked a passer by directions to a place in Rochdale, he kept mentioning what sounded like 'rorborts'. At first I thought he meant traffic islands, roundabouts, but then realised he was meaning 'traffic lights'.