1. A total screwup; a person who is destined to be a failure in life.
2. Also means a stupid/uncoordinated action.
1. "Greg, if you keep this up, you're going to end up a Yanis."
2. "Okay students, raise your left hand" said Mrs Perkins
*Josh raises right hand*
"Josh, that was a serious yanis move right there" said Kim