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Contraction of "Nasty Biscuits": A chick who looks good, but after s.xual relations, proves to have a type of contagious venereal disease.

See also nastydax which is the result of sleeping with a nastybix.

Also see your s.xual health clinic!!
"Stay away from that girl man, she's Nastybix"

"What flavour?"

"Seafood: Crab to be specific"

"Aah I see. Thanks for warning me"
by t. thyme-cookie November 30, 2006
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