A fork of Rural Dictionary
That look on a girls face when you cum on her tits. Not a full on grin, but just a subtle smile that you aren't sure what it means, but you think she's enjoying it.
Sherry gave me her Mona Lisa Smile when I came all over her tits, but it went away after my buddy Tim nutted all over her face.
When you sit down in a bathroom stall at work to escape your coworkers and play on your phone, but then someone plops down in the stall next to you forcing you to leave earlier than planned and go back to work
I was sitting in the shitter at work checking Pokémon Go when some dude came in and pulled a total Commodus Interruptus on my ass. I had to leave before my nose hairs curled too much.