A word used to describe a person who is too awesome and sexy for words; fabulous beyond belief.
Have you met Killian's best friend, Robert? He is such a Yesko! I need to get into his pants right now then take him to meet my mother and everyone I know.
A specific type of peek created by yekoro (aka der YEK) which involves strafing around a corner and killing your opponent in first personshooters like CSGO
Person 1:*clicks on opponent's head*
Person 1: Oh boy, i just yekoropeek'd the fuck outta this guy, XANTARES ain't got shit on me!