dismissive insult. implies incest in the person's family and links to travellers.
shut up! your ma's your sister!
by hepburn May 14, 2008
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This is calling your sister a hard lesbian
your mom gay, your dad lesbian, your granny tranny, Your grandpap a trap, Your uncy funky are nothing compared to this
Person 1: ur mom gay
Person 2: your dad lesbian
person 1: your grandpap a trap
person 2: your uncy funky
person 1: your sister fist her
person 2: slowly melts
by Who_really_knows March 16, 2018
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On October 25th you can slap your sister all you want and you won’t get in trouble.
Hey why is your sister crying

Because I slapped her for National Slap Your Sister Day
by boppotheclown October 24, 2020
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Used in speech when talking to some ugly girl, but their sister is hawt. Only use this when the ugly girl is making advances on you.
by AdolfHitler'sBastardSon May 10, 2016
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Like it sounds. Also the name of a song by the band called Analy Inserted Angle Grinders from Dominic College in Tasmania, Australia.
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