Someone who just sort of lurks on the outide of a group of people and doesn't say or do anything. Generally. a Yette (pronounced yet-a) doesn't know the group of people all too well, and makes everyone else in the group sort of uncomfortable. Tends to smile and stare a lot.
Bob: yeah i was at this party last saturday and it was so funny cause...
*everyone notices the yette standing a few feet away and obviously listening to the conversation, with a smile on is/her face.*
*everyone slowly shifts away or turns back on the yette*