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Peter Sisters 

When you and your friend fucked the same dude. Not necessarily at the same time.
You fucked Jon last night?!? *HIGH FIVE* I fucked him back in high school! We're now PETER SISTERS!!!
Peter Sisters by bigbootyjanet November 5, 2018

able sisters 

tommyinnits favorite song ever that he always plays on his stream
*tommyinnit streaming* LETS GET SOME POGCHAMPS AND SOME ABLE SISTERS ON
able sisters by Emmy Conley April 22, 2021

Twin Burrito Sisters

Pair of two girls that are the bestest friends in the world and are super nice. Usually one of them will be a bitch, but once you get to know her, she will be an amazing person and friend. Also will fall for any guy. The other one will be super shy and introverted at first. But, then as you get to know her, she becomes the life of the party and is amazing to have around. As a bonus, they are both thicc asfff. Great to have around as they are both very weird and funny.
Dang look at them. I bet they're Twin Burrito Sisters.
Nickname for your sister when she's acting like a turd.
Sisturd, don't be peeved because I called you out for not contributing your fair share for Mom and Dad's birthday gifts. It's not my fault you smoke all your money.
sisturd by becsmoneybooty August 11, 2008
Sistard sĭs'tärd' - noun - female offspring having both parents in common with another offspring; also a female sibling; that is also slow, dimwitted, and/or appears mentally challenged with the severe level of intelligence deficiency, yet is allegedly cognitively normal according to the standards set by society.
My Sistard drives me to intense feelings of fratricide.
Sistard by Wraith0 April 6, 2010
When you want to have respect for your sisters
Sister 1: girly guess what I just enlisted in the army

Sister 2: okay wow Sirster
Sirster by Edoto November 24, 2018