Used as a general term of approval/encouragement upon hearing a statement which you agree with. Derived from the English word 'up'. Origin: Ireland
"Do you know that Weso is from St.Mary's Mansions?", "is he? mup the flats!"

"Did you hear the town are in the county final?", "mup the biys!"
by Activities Elk May 25, 2020
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Cork slang, used when a gang of friends go and have a great night drinking alcohol
"Dean kearney has 24 cans of tesco lager, mup the sesh!!!
by Coldones September 09, 2017
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