flexing her cunt

When one is publicly displaying how much of a cunt they are.

At a Michael's Craft Store

Woman checking out at register - "I wanna speak to the manager. I've been waiting on this line for 1 minute! I need to pay for my 30 bags of chocolate like a fat fuck! This place is the worst!"

Correct response to this horrible person - "Wow! Look at that woman over there flexing her cunt!"