Momma, she nasty

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!