Definitions by The Drs

Mona Lisa Smile 

After you cum you take the residual cum on the tip of your penis and apply it like lipstick to your partner's lips.

"Wow, Sam's lips look really shiny," Friend 1.
Friend 2, "Yeah, I just gave her a Mona Lisa Smile."

Mona Lisa Smile by The Drs September 2, 2010