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A combination of the adjective 'gash' and the bodypart 'nads'.

Something being described as Gashnads can be considered to be poor in quality, worthy of comic ridicule and offensive in its general shitness.
"Man, let's split, this bar is fucking gashnads."

"Hey man do wanna go and see Nickelback?"
"Fuck off you utter rapist, they are fucking gashnads."
by The Hectician September 10, 2008
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