Flashing or showing your tits (if female) or genitals (male or female) to one or more persons with the intent of attracting their attention and creating a sexual response.
Carla got laid repeatedly over summer break. She just went to the beach and flashed credentials.
I made this up from listening to too much rap songs and still use it. It means something similar to the word "fly"- totally cool, awesome, amazing, impressive.