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6.
The act of Winning and being a Twin.. simultaneously.

Being Able to do anything you want exceptionally well with you're twin.

All Arguments Against TWINNERS Are Invalid
Yo man, look at will and garby dude they're always Twinning.

DUH #Twinning
by lyrically genius June 03, 2012
 
1.
Act of having intercourse or sexual relations with a set of twins.
Excuse me, Im Twinning
by hrod_55 July 19, 2011
 
2.
Doubling your sexual pleasure by getting it in with lesbian twins.
Dude 1: I got hot DTF twins comin over tonight.
Dude 2: Bro, you are so twinning!
Dude 1: Duh... Twinning!
by StattnMacy August 18, 2011
 
3.
A take on the popular term "winning," it refers to identical thoughts or behavior, as well as to brilliance.
Person 1: "Oh my gosh, I was just about to say that!"
Person 2: "TWINNING!"

Person 1: "Uh, we're wearing the same sweater?"
Person 2: "TWINNING!!"
by .,.,.,.,.,. January 06, 2012
 
4.
When two females begin to sync their shaving patterns.

A.K.A. Their armpits and/or other bodily parts.
Lindz: Hey Britt, how are your pits today?
Britt: Great, I just shaved them last night!
Lindz: OMG, me too!
Britt: We are so twinning!
Linz: Ya we are!!!
by vagattack March 27, 2014
 
5.
you are the same as someome. created by the sasskateers.
omg she is sooooo twinning with me!
by goddd June 27, 2014
 
7.
Twinning is performed by having intercourse with two twins. Your Winning with Twins, Twinning.
Guy1: "Yo, what are you doin' tonight?"
Guy2: "Twinning."
Guy1: "amazing"
by Jwatter August 18, 2011