My sister told me that 

What you say at the end of an epic story, thinking that you'll will either get a laugh or agreement from your audience, only to find vacant faces.

"So after the third trip to the drinking fountain, I just didn't want anything to drink.....(vacant faces).....the end. My sister told me that."

OR

"Did you know that blind people dream?"
(Pause)
Reply: "Did your sister tell you that?"

My sister told me that by JF_Jesus April 15, 2010

cucumber sister 

When two females acknowledge having been intimate with the same male and remain on good terms, the women are now bonded by having shared the same cucumber at one time or another.

This can lead to perks by making the information known to other females who you can network with.
Female 1: "Yea girl, I got us a hook up at the show tonight, we don't have to pay cover"

Female 2: "Sweet, how'd you score that?"

Female 1: "Me and the door gal are cucumber sisters, remember that blonde guy from last weekend?"

Female 2: " props

cucumber sister by Bakert6734 September 1, 2013

ur sister fister 

Stronged then any of the ur mom gay insults

Person 1 : ur mom gay

Person 2 : ur dad lesbian

Person 3 : Ur granny Tranny

You : ur sister fister

*world melts and universe explodes*

ur sister fister by Zygno April 4, 2018

Ur sister 

Ur sister a sibling that is your brother just a girl.

Person A: i had fun our sleepover last night.
Person B: i had fun with ur sister last night.

Ur sister by Happyhappy_cupcake40 June 24, 2018

Your Sister Mister 

An insult that has the same effect as your mom gay.

Friend 1: Your Mum Gay
Friend 2: Your Sister Mister
Friend 1: *Dies From the Insult*

Your Sister Mister by Nickable May 12, 2018

Ur sister a mister 

Only use this phrase if you are prepared for the consequences. This phrase is the offspring of “ur mom gay” and “ur daddy lesbian,” and the breeder of it was Satan himself. It is the worst thing that you can say to someone. If the arguments gets to “ur grandpap a trap” and it’s your turn, chain yourself down before you use this. It’s deadly.

Steve: ur mom gay lol
John: no u
Steve: ur dad lesbian
John: ur granny tranny
Steve: ur grandpap a trap, ha, no coming back from that!
John: *chains himself down while fire sprouts from every hole of his body*
UR SISTER A MISTER!!!!!!!
Steve: *explodes into atom size pieces that are on fire as Satan pulls his soul down past hell to the unknown
God: *tears pour down his face* holy shit!

Ur sister a mister by Thicc Lobster May 15, 2018

sissor sister 

women who has sexual intercourse with other women in the shape of two sissors cutting at each other.

"Helga and I totally are sissor sisters together"

sissor sister by c!rclec!rcled0td0t February 5, 2010