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A person who changes gender or sexual orientation later in life much like the way that a grouper can change sexes after maturity but never in a hot coed porno kind of way.
"I can't believe my wife of 20 years went grouper on me and started bangin' bull-dikes"

"Bruce Jenner turned grouper and is now Caitlyn Jenner - from Wheaties to Froot-Loops at 50 years of age."
by fffrick August 21, 2016
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An ugly girl with a big mouth who tends immerse herself in group settings.
Mark: Who was that ugly chick back there who wouldn't shut her fucking face?
Jeff: That's Gina, man. She's a huge grouper.
by CiseJ May 25, 2009
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a grouper is one worse than a minger - a bare ugly person. Named after the grouper fish.
Oh man, forget a bulldog chewing a wasp... she's a grouper.
by Adam J February 05, 2004
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A moocher, a leach, a bottom feeding fish. Someone who tags along to parties they aren't invited to. Claims to be friends with people he/she has only met once. Likes all posts on social media by people considered popular.
Who is that girl at the bar? I don't know, must be some grouper that snuck in with Jeff.
by Andre5000 June 15, 2017
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Comes from the well known fish species assynidae - often used to describe someone in a non-complimentary fashion. He is a massive grouper - he is a large, fat, "fish" - derogatory term used especially in card games.
by M_O_U_L_D June 04, 2004
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