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sexual intercourse with an individual mainly for the amusing anecdote (i.e. a shag for the banter)
-Why did you shag that last night? It looked like an umpa lumpa?

-Not many people can say they've shagged an umpa lumpa, can they?

-That's true. I guess it was a good banter shag.
by gggigggi September 21, 2009
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