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1.
only a man can be called this, preferably
an identical twin. its a slang word that hasnt been around for a while. it relates to drawing the short straw in the DNA gene pool, hence one twin is thicker than the other.

T-thick
W-wanker
A-and
I-`is
T-twin
``that brian is a right twait``
by mark pooh June 20, 2005
 
2.
Verb - To confuse condiments with condoms and quickly realize after your annual physical that there is indeed a difference.

Noun - One who twaits.
"Dude, I smell like a ballpark. I must've twaited last night. Well, hopefully those antibiotics work again."

"Please, for the sake of those around you, do not be a twait."
by Rebecca Goldschmidt June 08, 2007