Yhetti is a term used to describe a person who takes part in the sport of skiing and has no visible talent whatsoever. They often wear jeans, a puffy jacket and very often have a "yhetti gap" between their goggles and their hat.
That guy is such a yhetti, he can't even ski down the flathill.
An adjective for describing a large line of cocaine. A yetto line is usually much larger in size and will most definitely get you extremely 'coked up'.
"Katie just busted me out a yetto line and now I'm super skeeted."
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi