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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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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A female in which you probably would hate if you didn't share the same parents. But because you do, you get to see EVERY aspect about her. She shows you her tears, she shares with you her jokes, and with that her laughter. And sometimes, her deepest emotions and though it's only for a mere moment, it is the most beautiful part of a human being and it is what reminds you of just how much you love her and why. With that being said, she is also going to be relentless and confusing as all hell at times and one may not even know why they were ever friends with the other. My sister has eyes that reflect the world as she sees it and the world, it always becomes more estonishing. Growing up with a sister is a blessing I wish not to take back but I hope one day we'll be able to have better communication. (: I'm sorry you've had to see the worst of me, and all my awkward stages, but I'm so happy that it was you that got to see the best. You have kept me out of so many mistakes and bad experiences and for that I am so entirely greatful and wish I had better words to describe it.
My sister likes to pretend she's on and island far from me but if I'm really gone, she will come to me and rap herself around me and ask why I'd leave her for so long, though it was only for the weekend I had been far. I can not part from her for more than a few months, I would not ever admit that.
by Lavenderlove March 24, 2015
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The person you would want to hate the most in every situation. Also the most annoying and mean person in the world, meaner than Kim Jong Un! Your sister is also related to you, in case your dumb and don't know what a sister is. Your sister can only be a very ugly girl. When a sister is a teenager, she will spend most her time on her phone and get mad at you for no reason. Sisters mostly call you names such as: " dumbass, cunt, doodoo, dumb dumb, and the most popular, fuck asss."
Sister : " Wut up FUCK ASS!"
Me: " Ummmm........ HI!"
by Dudeguy599 September 29, 2018
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if your sister is a lesbian, the act of her scissoring with her partner
hey, i'm coming in, quit sistering!
by unoenglish June 8, 2011
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