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1.
Crude term for the female genitalia.
Can also be used as an insulting phrase.
She has a great fat stinking gwatch!

or

You are a gwatch!
by Matt Whalley June 17, 2003
 
2.
Gwatch is a word of welsh origin that refers to the genital area of a female.
Every woman has a gwatch.
by aimeel May 27, 2007
 
3.
Origin - The University of Birmingham - a chap rather accustomed to brightly coloured trousers.

Commonly used, though ill approved term (especially when uttered in the presence of a female) making reference to the genitalia of a female/general presence of a female.

Favoured most notably for its distinct onomatopoeic effect.

Can also be used with great effect to discombobulate a member of the female sex who is unaware of its definition. Pick your yat wisely, however, as you don't want to ask someone who knows the definition. This game is called 'Risk Gwatch'.
"Excuse me gwatch"

"Alright gwatch"

"Her gwatch flaps are epically large"

"Excuse me, may I please use your gwatch?"
by Nick Barrett III June 30, 2009
 
4.
a horse's vagina
that horses gwatch is dripping
by gwatchasaurus February 05, 2010
 
5.
Origin - The University of Birmingham - a chap rather accustomed to brightly coloured trousers.

Commonly used, though ill approved term (especially when uttered in the presence of a female) making reference to the genitalia of a female/general presence of a female.

Favoured most notably for its distinct onomatopoeic effect.
"Excuse me gwatch"

"Alright gwatch"

"Her gwatch flaps are epically large"
by Nick Barrett IIII June 30, 2009