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Having someone masturbate you with one hand, then catching the jizz in a mug that they are holding with the other.
"I met an interesting girl/boy last night. Gave me a right good old mugging off."
"I was down at Whatever Bar this weekend. The number of people who were looking to get mugged off was surprisingly low" / "Really? There must be a mug shortage in town".

"Had a disappointing evening. Got mugged off with a flimsy plastic cup." / "Well, ceramics is a dying art."
by autodefa June 14, 2015
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