A shag monster is British slang for someone with an outsized and enthusiastic appetite for casual sex — the person in the group whose romantic life resembles a particularly busy revolving door. It's more comedic than genuinely judgmental in most usages, often deployed with exasperated affection toward a friend who can't seem to stay out of someone else's bed. The 'monster' element amps up the hyperbole, making it sound less like criticism and more like a backhanded compliment.
Ever since his divorce, Dave had apparently transformed into a complete shag monster according to everyone at the office.
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(UK, slang) A sexually promiscuous person.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.