Derived from the name of the neo-slavic fertility God Martin, Marto is often used either as a direct synonym for sex, or to describe someone especially sexually appealling looking.
Wow, Kendra is looking soo marto tonight...
Hey, gorgeous, wanna go up to my loft and have sweet marto with me?
(n) office bike (applicable to either gender)
"That new girl on the fifth floor is a right marto. She had eight blokes at her last firm and most of them had girlfriends....."
A faggot that thinks he is not and dickrides everybody.
You are such a marto dude.
You are the hoe of the city.