Top definition
Whenever a girl does something slutty and is proud of it.

Said with the same idea of a little kid tattle tailing.
Example 1
Boy 1: Look at Kayla grinding on her best friend's husband!

Boy2: Damn. Mama, she nasty!

Example 2:
Boy: I bet you wont flash us

*Girl flashes guys*

Boy: Momma, she nasty!
by pootts December 18, 2011
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