A Rosalyn is a teenager in high school, and, more importantly, a babysitter.

These girls can handle almost any type of child, provided that they get paid some extra, extra, moolah on the side. Children are often intimidated or scared of her because she is just as cunning as they are.

First seen in Calvin and Hobbes.
If you ever need a babysitter for your cute, yet manipulative kids, the only one who will agree to do it is that girl across the street. She is clearly a Rosalyn.
by Cagefight December 06, 2006
1 more definition
Top Definition
the most awesome wonderful girlie in tha universe....... yes she is for real
Dude, that is so Rosalyn!!!!! I wish I could be like that!
by bobolina May 21, 2005

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