At the grocery store, we run into the girls cousin (dad's side). They chit chat, and I notice the other kid's fly is wide open.
Me (to A): You're flying low.
A: *blank stare*
Me (trying to be discreet, failing miserably): You're flying low.
A: *grin, more blank staring*
Me: Okay, bye.
We walk away.
Me: I don't think she knows what that means.
T: No, me neither.
Me: Do you want to go back and tell her?
T: Meh. She'll figure it out.