Similar to the Brother Zone, except to a woman. Pretty much, the guy/girl you like comes out with: "I like/love you like a sister". This can be done by men or women.
Chick 1: Hey sweetie, how did it go with Dan?
Chick 2: Shit. I just finished pouring out my soul to him when he tells me that he loves me, but only like a sister.
Chick 1: Shit. Sister Zone sucks.
Girl: "You do so much for me. Thanks for always standing up to me."
Boy: "Yeah of course. You are like a sister to me."
Girl: **Dammit...he just sister zoned me** "Yeah. You are like a brother to me."
n. like the friend zone but for girls; the guy cares about the girl but due to whatever reason (small in stature, young looking, one of the guys etc) he sees her more as a little sister than someone he would go out with; tough for the girl to ever get past this stage; they might think you're kinda cute but that's as far as it gets
When a guy/ girl you like says "you are like my sister" or "you are like the little sister I've never had" or "I love you like a sis" It is worse than being friend zoned, it's all the way past friends to family. You probably have a 2% chance of getting out of the sister zone and having a relationship with that person.
When a hot guy refers to you as a "little sister" because you are younger than him or/ and "innocent" compare to the shit he does; similar to friend zoned in that you're seen less than what you wanna be but yall still remain good friends but he just sees you as a little sibling
"...Yea Elizabeth is like my bestfriend too, actually my little sister... CUZ SHE'S 14 lmao!"
"Damn Taylor you just got called "little sister"sister zoned by James haha"