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"
"Her gwatch flaps are epically large"
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