1. a female sibling

2. a female friend that acts like, loves you like, and treats you like a sibling.
I don't have any sisters.

My best friend is like a sister to me.
by King's Daughter June 20, 2005
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A Sibling of the Female sex, whom's goal is to create complete hell for the older sibling.
by Sirius July 8, 2003
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How Allie and Erika describe their secret lesbian relationship.
Allie: Oh, oneesan! Feel me up! All the cute green eyed boys are so fickle or homosexual! We're sisters!

Erika: Oh my imouto, I am simply not in the mood! I need to watch more anime sex scenes with my grunting father! He lives for nothing but the climax!
by Allie Caulfield February 10, 2008
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can be pretty bitchy people, may often get into fights, they may steal your clothes and not give them back, could also steal your boyfriends, but some sisters are very trustworthy people, and in the end sisters love eachother
my sisters stole my clothes
by mr. poppy seed April 16, 2011
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There are two type of sisters, ones the good friend kind, she'll always seem to be there somehow when you need help and it just seems like a good friendship instead of having a sibling. You and your sister would often ask each other for favours and sometimes pull a couple pranks on each other and can keep a secret, it might seem strange sometimes but at the same time natural.

The other kind is the very annoying type, she is most likely very annoying and would really embarrass you in front of your friends, unintentionally, and intentionally. often quite arrogant and takes every advantage to crush your social life and confidence.
1. my friend carries his sister's stuff to school for her, in return he asks to borrow money from her whenever he has a sudden urge to raid a vending machine for candy.

2. my friend "Ok seriously, every time i come over to your house your sister is screaming, and now she's gonna come to your grad and probably scream because unlike you , she didn't get a date for the dance? That's rough."

Me "yea i know, she's gonna ruin it for me."
by sdjhfbskd July 11, 2008
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A smart, beautiful sibling who always has good advice for her brothers, who are always acting like buffoons.
Brother: Oh no! I have nothing good to wear on my date with the school slut!

Sister: I think you should dump her, you might get an STD. But if you insist on dating her, you should wear your black slacks and this white button up shirt.

Brother: Thanks Sis! You know what, you're right! I will dump her, and I'll ask the new girl out instead! Thanks a bunch!

Sister: You're welcome.
by Barb Ann October 27, 2006
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Some girl who thinks that just because she's related to you, can just waltz into your house and eat all the strawberry flavored yougurts when she knows that thoes ones are your favorites!
You know your sister has broken into your house when

A. You turn on the TV and it's set to the Style Network.
B. There's tire tracks on your lawn.

C. Your cat's liter box has a human poo in it.
D. All the strawberry yogurts are gone.
by Woodrow Thrillson June 26, 2010
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