2 definitions by t. thyme-cookie

A) A male who has contracted venereal disease from sleeping with the 'nastybox' of a nastybix

B) A male version of nastybix. To be avoided at all costs by both males and females.

Identifying features:
Painful walk
Painful smile
Painful frown
"Stay away from him. I heard he's been with Bianca and now he's a Nastydax"

"I got me some Daks. NASTYdax! Mwahahah "

"My Nastydax are serious man. Clearasil don't help!"

by t. thyme-cookie December 1, 2006
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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 December 1, 2006
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