(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?"
The male version of a "bridezilla." A man with utterly unrealistic expectations of their own wedding and how much they should be accommodated. Portmanteau of "groom" and "lunatic"
Steve was insistent that the only alcohol being served would be Cristal. He was becoming a complete groomatic.
Alan couldn't believe his husband to be was insistent that they take their vows dressed as Power Rangers, he'd began shouting and acting like a groomatic.