This is an urban term used to imply that you plan to beat a person like there mama. Although, the person saying this phrase is not related to them.
"James shut the hell up before i uncle sister mama yo ass"
worse than ur mom gay and ur dad lesbian and worse than ur granny tranny combined
trevor: yo kyle ur granny tranny
kyle: ur dad lesbian
trevor: no u
kyle: ur sister fister
trevor: *dies instantly sun breaks a piece of*
The TBHK AU where Kou is really sad and a tree kills his sister and stuff.
I have a really bad addiction to it.
“Do you know Tree Sister?”
“No.”
“You’ll know soon.”
Sibling1: *gets mad cause of something their sister said*
Sibling 1: *starts mocking her*
Sibling 2: she’s an idiot sister
A sister whomst you trust with your safety at all times, especially at like a frat event.
"Hey my homie, need a safety sister for tonights super dope frat event?"
"What's a safety sister?"
"I dunno man, ask Trent."
Redz Sister, who is quite a baddie I am not gonna lie with you guys
Redz sister is a baddie
Sheehan’s sister is what you call your friend hot sister
Damn, Michael has a really hot Sheehan’s sister