Nash Equilibrium
The act of a female flatulating during climax while receiving cunninlingus resulting in her partner being blown in the face by fart gas.
ohhh ooooo pffttttt... gross babe, I've just experienced Nash Equilibrium.
Nash Equilibrium
When you're pretty sure you don't want to fuck your friend's boyfriend again but you also don't want to tell her about the first time so you just keep your mouth shut.
He's being a real dick but I'm in a nash equilibrium and if I say anything it will all kick off.