Probably one of the most hurtful insults that can cross your tongue. Used only in extreme circumstances to completely obliterate the other person.
Person 1: “I just stole your memes.”

Person 2: “well ur mum gay.”

Person 1: *dies*
by OmeletteBoy February 14, 2018
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The worst possible insilt any human can take in. If you say this your opponent will literally implode from embarrassment.
4th grader A : Ur momma so fat shes fat
4th grader B : Ur mum gay
4th Grader A: *dies*
by ThrillCosby February 24, 2018
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"ur mum gay" is a meme used by non-normies. while they unironically dab, you can laugh to yourself bc their mum gay

P.S. the correct response to this type of situation is "no u." the person who said ur mum gay with be banished to die in a small hole 5ever.
Person 1: "ur mum gay lol"
Person 2: "no u"

OOOOOOF
by sprrite March 13, 2018
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She is lol
Person 1:"I don't like you!"

Person 2:"well ur mum gay."
by Hou se October 23, 2017
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The most epic comeback ever. All 12 yr olds and 9 yr olds favourite. If someone says ur mum gay in an agreement you have lost. DO NOT TRY TO FIGHT ANYONE THAT SAYS THIS BECAUSE THEY ARE ATLEAST 6FT AND MASTERS AND GAYKWANDO. YOU WILL GET BEAT UP.
hey bro i heard u smashed my girl
ur mum gay
HOLY SHIT CALM DOWN BRO WE KNOW UR BIG

thats right
I'LL BACK OFF
I'll 1v1 u in fortnite
NO U DIDN'T JUST SAY THAT
yes I did
UR TOO SAVAGE I WIll BACK OFF, YOU CAN SMASH MY GIRL ANYTIME
by AttRAcTivENeighBOurHoOdStD April 21, 2020
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a stupid insult made by dumb 11y/o boys
kid 1: u cant use my crans
kid 2: uh- well...uR MuM gAy
kid 1: ugh, ur so annoying -_-
by _.dido_. July 21, 2020
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The greatest insult of all time. Saying these words can actually destroy the very fabric of existence itself, if used in a roast battle properly. Luckily, this will likely not happen, as anyone who uses them in a roast battle can’t even finish the words before being decintegrated as they couldn’t comprehend the sheer power of this insult. The other person being roasted though is decintegrated too. In fact, everyone within 69 kilometers of this saying is decintegrated. As you can tell, it is the spawn of “Ur mum” and “Ur gai”. It has many siblings, such as “Ur dad lesbian”, but none come close to the sheer unfathomable power of these words.
Ur retard
“Yeah, well ur mum gai- AAADAAASDFGSHSHEHD
by PPSLAYER611 April 23, 2018
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