O smile
A huge grin that only comes after you’ve had so much sex you can’t even feel your legs. It's like your face is saying, 'I don’t care if you're ugly, I just want more.'
She had the O smile after getting pounded by three guys in one night.
He had the O smile after eating a whole pizza and getting laid.
She had the O smile after getting called 'honey' by a guy who looked like a goat.