a Wairarapan (province of New Zealand's North Island) term for Prostitute. Often used as code talk when talking about sexual liaisons with aforementioned 'working girls' especially when in front of one's girl-friends/female friends.

I feel like rostying(v) it up this weekend

Thai Rosties are often defined as having silky smooth skin
by Porn King November 20, 2007
Hottest guy that you will ever meet.
I saw Rosty!! He is so hot!! I want Rosty.
by SMEXXXI GIRL September 25, 2010

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