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1.
(n.) a man who is married to a woman, for seemingly no sexual reasons. His only use to his wife is purely for reasons of social and financial convenience.
"Ted complained that he and his wife hadn't had sex all last month. When will he realize that he's just a groommate at this point?"
by DarkApp January 17, 2010
 
2.
A male friend (or roommate) of yours who is getting married.
Mike and I aren't really friends, so much as groommates.
by goshdurnit May 29, 2007