Twincest

Twins in which engage in sexual intercourse, or fullfill each others sexual desires.

Some famous examples are:
The olsen twins are twincest
the Harvey Brothers practise twincest

by Dylaoptupus February 5, 2010

twincest

A suitable subject for Harry Potter slash fiction about a certain pair of Weasley brothers.

Fred/George = TWINCEST!!!

by Alianne September 14, 2003

TWINA

TWINA stands for Thumb Wrestling In Nick's Anus. As this practice becomes more commonplace, participants find that the use of the TWINA acronym is more convenient.

See also thumbwrestlinginnicksanus.
See also analthumbwrestling.

Anyone up for some TWINA?
My thumbs are sore from last night's TWINA match.

by Joey Twina August 10, 2004

twine

pussy; twat; vagina.

a twine-seeking missile.

by joey, joe d, richlee, and justin November 9, 2007

twincest

twins having sex.. its so wrong, yet it feels so right

me and my twin have twincest. i fuck my twin, and enjoy it.

by nadia_aidian February 28, 2004

twining

the act of which twins dress and look the same on the same day.

Brittany and Brandice entered the room looking the exact same.
Kim: omg they're twining today!
Class:LOL
Finney: lol you should put that on urbandictionary!
Kim: lol i should!

by Princess64943 April 9, 2010

twin stream

A post coital piss that sprays in two different directions.

"Have you been up all night shagging, James? You just hit me with your twin stream."

by Matt Thomas February 5, 2004