"ur mum gay",is a phrase we're a new player in ROBLOX says,in a game called Auto Rap Battles .ROBLOX is a "Kid Friendly" game.We're you can play lots of games like jailbreak.Jailbreak is a game in ROBLOX. Mostly,famous youtuber or people who uses "ALT" accounts usually use this phrase in ROBLOX to troll,for not getting banned in there main accounts.If you see avatars who has a "bacon hair" on there head (the item is called "pal hair") and bam you know what there doing.
by GmodRain07 June 6, 2018
Get the ur mum gaymug. by Wikipedia boiiiiii January 11, 2019
Get the Ur mum gaymug. 
by specialvixtimunit May 21, 2019
Get the Ur Mom Gaymug. A much simpler way of saying your mom has large lesbian, many people have used it as an evolved yo mama joke.
by Westvagina March 16, 2019
Get the ur mom gaymug. if someone says this to you, you might as well go hide in a basement for the rest of your life but to avoid this you must use the almighty "ur dad lesbian" only lv 50 bosses can use this godly ability
Bob: your a gay piece of gay jimmy
Timmy: y...your mom GAY
Bob: *begins to have epilepsy and then dies*
Timmy: y...your mom GAY
Bob: *begins to have epilepsy and then dies*
by SeriousMemes.com February 1, 2019
Get the ur mom gaymug.