Slang used while referring to going to have a drink down the pub.
Most commonly used in the North East of England. Due to it being originally derived from people who drink/drank the ex-Newcastle brewed alchohol, Newcastle Brown Ale.
The sentance itself is actually printed on the label of the newer bottles of Newcastle Brown.
Fred: Doing anything decent this weekend?
Bob: Going to see a man about a dog on friday if you fancy coming?
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