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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this is legit deadass the worstest insult you can use on someone,worse than your mom gay, your dad lesbian and your granny a tranny say it out loud and every nigga within a 17 feet radius just dies as they hate their brother being their mother
by Big_nigga103 March 18, 2018
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Possibly the most dangerous phrase since humans have developed vocal cords, above “your sister a mister” and “ your granny tranny”. Every time this is said the universe speeds up, the sun expands and god himself worries for his future
person 1 your mum gay
person 2 your dad lesbian
person 1 your granny tranny
person 2 your sister a mister
Person 1 your brother your mother
god *cries*
by @matwai_ on ig March 17, 2018
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The supreme comeback. The five words, that if used in succession, will force the entire known universe to collapse within 4 microseconds. This is never to be used until it is absolutely needed.
Billy: Ur mom gay
Tom: Ur dad lesbian
Billy: Your sister is a mister
Tom: Your brother be your mother

*Everything instantly collapses and everything stops existing*
by PlebGuy101 March 16, 2018
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