Comes from the old legends like: your mom gay, you granny tranny etc. But this is the evolved ascended form that involves two greater insults in one form soon it will be the trinity with 3 insults
Bob: hey

John: your mom gay
Bob: no u
John: your brother a mother and your mother gay
*The devil is instantly summoned and drags billy down to the deapths of hell to rot for all eternity
by Yeeetsrt March 27, 2018
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Your Brother a Mother is the newest edition to the insults. This has every other insult topped, when hearing this the recipient will most likely go jump off a bridge immediately
Person: Ur mum gay
You: Yes but are you aware of the fact that your brother a mother.
Person: * jumps off bridge
by Fractured reality March 22, 2018
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An insult even worse than your grannys a tranny and your grandpaps a trap.
bob: your mom's a man
Joe: your dad's a lesbian
Bob: your grannys a tranny
Joe: your grandpaps a trap
Bob: your brother's a mother
by Flyfishermansam March 14, 2018
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Similar to "your sister a mister", but this horrifying insult implies that 1. your brother is in fact a woman and 2. your brother has given birth to a child
person a: your sister a mister!

person b: *unaffected* your brother a mother.

*person a dies, Jesus comes back to earth, Obama is there*
by Fujitsu March 17, 2018
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Worse than your sister a mister after a night out in Hiroshima swimming in the radiation pools.
Dave: u mum gay
Phil: your brother a mother
Dave: bursts into flames as the universe begins to shrink at the speed of light, sirens in the distance.
by Put_me_in_fire_42069 March 22, 2018
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An absolutely diabolical insult, extremely similar to "Your Mum gay, your daddy lesbian, and other such". This is an insult on a scale with power similiar to that of God himself, so, unless you want the universe to crumble before you, do not use this terrfiying phrase.
Carl: Your Mum Gay!
Dylan:Your sister a mister!
*The Earth begins to shake as Carl readies the blow to Dylan"

Carl:Your brother your-
Dylan:DON'T SAY IT CARL!
Carl: I must.... YOUR BROTHER YOUR MOTHER!

*Cries are heard from across the universe as, atom by atom, molecule by molecule, the universe begins to crumble away, for not even God can save us now*
by Gabe_TryToFindMeNow March 18, 2018
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