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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.
sister by Nasemeister December 12, 2012
Used in Texas or other southern states as a synonym for wife
"this is my wife/sister"
Sister by GayFlute January 19, 2017
1.A black female
2.A word that can be used in a greeting to show friendship of a black female.
1.Is the girl you was talking about a sister? (Sista.)
2. What's up mah Sista?
sister by JR. December 12, 2004
A word commonly used by the no longer relevant James Charles after he was exposed by Tati. You would say it before somebody's name, to say they are your friend.
"Omg hi sisterEmmalyn!"
"James Charles is cancelled now don't use the word and sister."
Sister by Heeyyygirl May 15, 2019
An annoying person whom your parents love and cherish all the time, completely forgetting about you.

They usually get whatever they want, especially if they are younger than you are.

If they are older they get all the attention because they act out.

Every once in a while they can be somewhat sweet, but that's only every once in awhile.

They can throw tantrums, and your parents will finally cave in.
my mom doesn't really force us to do things. all my sister has to do is give her the silent treatment, and she gets it, Wala!

I'll tell my sister that I'm going to do something before her, and then she just goes and does it just to prove that she can get away with it.
sister by Sastina January 30, 2007
Female sibling. A sister is a childhood best friend, lifetime protector, you’re rock and the mother of you’re nephews/nieces. A sister knows all of you’re flaws and loves you just the same. She also knows all of you’re strengths. No one keeps secrets like a sister and that is something very special. While you always have parents, not everyone has a sister. That makes them all the more special. Often many called their sisters “sissy” into adulthood or just referred to as “sis”
sister by Lindee August 23, 2018