When two friends randomly text each other or shout “Surprise” at any moment.
“Hey Morgan, guess what?”
“What is it?”
“SURPRISE!”
“Yassss Surprise Sisters!”
A man who typically gets together with his girlfriend/ wife's sister (before they get together that is otherwise we wouldn't really call him a man)
OMG, he made out with Jane's sister right before they got married, he is such a sister wooer.
A variation on eskimo sisters, referring to two women who ALMOST had independent relationships with the same person.
Wait, you almost slept with Jared? That almost happened to me! We're eskimight sisters!
A group of girls who had sex with the same guy.
"- Did you hear that Vanessa banged your ex?"
"- Yeah, I guess we're boner sisters now."
That one friend that is sassy and annoying but is also the best!
Bsf 1 - She's soooo sassy
Bsf 2 - yeah cause she's a SASSY SISTER?!?!
What you say when you meet another Eddie stan who loves him as much as you!!!
Person 1: "So you would die for eddie?"
Person 2: "Duh!!! I have him on my arm!"
Person 1: "Youre my sister in lawrence!!"
A friend that is being more scandalous than usual
Paige’s nudes were sister scandalous