The bestest friend.
Sorry, I can't go to that party tonight. I'd rather chill with my sister.
by RaptorMerewolf July 18, 2015

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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 10, 2008

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A Sibling of the Female sex, whom's goal is to create complete hell for the older sibling.
Be nice to your sister.
by Sirius July 07, 2003

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A Person; Generally Female
You are my sister.
by leftfootrightfoot April 02, 2016

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An annoying little shit
Get out of you sister you annoying little shit
by Dankyoda December 16, 2016

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one who is always true to you, no matter what. one who will always love you. one who will trust you. your best friend for life. your gaurdian angel.
by VicLyn1244 April 29, 2011

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(Verb) To terminate something in an abrubt or unexpected fashion. Derived from the sudden ending of Sergio's (BE) performance ("Sister") at the Eurovision songfestival in 2002.
After Jack was diagnosed with several STD's, he sistered his relationship with Svetlana.

"Art. 3: Watching midgetporn during working hours will sister this contract of employment and nullify all duties of the employer."

The problem with urinating from the Eifeltower is that you can't sister if the security guard catches you.
by Nasemeister December 12, 2012

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The Urban Dictionary T-Shirt

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