Ysis ysis is a girl that boys love. shes the type of girl that no one seems to know the wrod for. shes not that big up top but has a nice ass shes a flirt,a total virgin, and has never had a boyfriend. shes smart pretty and intelligent.she has a little to much mouth and attitude but is krazy and goofy and loud. she also outgoing fun to be around and a boy magnet. most boys think this type of gurl is so perfect that they dont even have all the words to descide her so they would just call her an Ysis. lots of southern people use this word.