Top definition
Acronym for - You Show Me Yours, I'll Show You Mine - often used when flirting with a person you find attractive or among exhibitionists.

Not for the faint of heart.
ysmyisym - If you show me yours, I'll show you mine.
by tyrant69 January 06, 2012
Get the mug
Get a ysmyisym mug for your cousin Trump.