Grummmate 

A threesque see 'Match Wits with Mensa, Omnibus Edition', the book that is a portmanteau of "Grumm" and "roommate". Your local friendly Grummmate is typically an entity who you share a room, house, or other vicinity with, usually in Minecraft.

My Grummmate is never happy!

Grummmate by certaminator August 10, 2025

grammateur 

an individual that uses poor grammar, either inadvertently or deliberately.

Bob never uses "their" and "there" properly in his emails. He's such a grammateur.

grammateur by chawalte January 23, 2010

grammateur 

A new grandmother who has no idea what she's doing with regard to grandmothering. (hat tip to JCW for the definition)

Bessie was obviously a grammateur, as she used safety pins to fasten her granddaughter's diaper together even though it had adhesive straps.

grammateur by chawalte January 31, 2010

Groommate 

(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?"

Groommate by DarkApp January 17, 2010

grammateur nazi 

One who provides unwarranted - and incorrect - grammar corrections.

Internet User #1: There so awesome!

Internet User #2: Their*

Internet User #3: The Grammateur Nazis have arrived!

grammateur nazi by Lord Pitaya November 30, 2013

groommate 

A groomsman who also has been the groom's roommate.

Kevin is upgrading from roommate to groommate status.

groommate by Keith Urban Dictionary October 3, 2021

groommate 

A male friend (or roommate) of yours who is getting married.

Mike and I aren't really friends, so much as groommates.

groommate by goshdurnit June 21, 2007