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flying sister twister 

sex position found on page 303 in the Kamasutra. triple 69 with two sisters and a lucky guy/girl.
Me and the olsen sisters did the flying sister twister last night!
flying sister twister by zack December 2, 2004

Younger Sister Syndrome (YSS)

When the older/oldest sister of a family oftens engages in a relationship out of spite of her already engaged or further advanced younger sister. Generally moves in with her new man, gets engaged, married or pregnant all within the span of the younger's term of engagement. In the long run, not a wise decision.

Most people have witnessed at least two of these instances. General outcomes of "YSS" include but are not limited too:
1. a jailed husband (physical abuse, drugs, theft, video taping women at work, etc..)
2. A miserable 6 month marriage
3. single motherhood
4. self pity
Observer #1: "Jamie moved into her man's house, got pregnant and has quit her high paying job all since her younger sister LeAnn got engaged to her her long time boyfriend."

Observer #2: "yeah, I heard her man has a ton of great qualities like...well, umm...nevermind. At least he drives a nice truck"

Observer #1: " Another victim of the Younger Sister Syndrome (YSS)"

your best friend's sister 

a stupid comeback phrase that's used for virtually everything, even if it doesn't make any sense whatsoever
Friend #1: dude! i saw your mom last night! she was hot!
Friend #2: your best friend's sister!
Friend #!: you have a sister!?

dude: what happened last night!?
dude 2: your best friend's sister!
dude: shut up!

He's my sister 

He's my sister
You see that person? *points to a mickey mouse cheese stick* He's my sister.
He's my sister by Dankius max February 23, 2019

Fake Sister

A term often used by males to describe their relationship with a girl who is not their girlfriend, but a close friend. This term does not apply to blood-relatives.

This classification boasts qualities typically seen in brother/sister relationships (e.g., mildly derogatory dialogue, occasional use of derogatory hand gestures, random story telling and re-telling, matchmaking, inside jokes, mutual-aid and support related to interference by outside parties, and the occasional transfer of funds with no repayment plan).
Person 1: "Did you see how fat so-in-so has gotten?"
Person 2: "Hey, watch your face, that's my fake sister you're talking about."

Person 1: "So-in-so said you loaned her $200"
Person 2: "Yeah, it's ok. She's my fake sister. I'll hit her up for $400 next time."
Fake Sister by wordalicious December 8, 2010

ugly sister competition 

Being offered the choice between bad and worse.
"The salvation of the pound is that its problem is not a pound-specific problem," he said. "It's an ugly sister competition and at the moment we're looking the ugliest. But if you sell the pound, what will you buy?" (The New York Times, Jan. 21st, 2009)
ugly sister competition by Roka_73 January 21, 2009