The same as updog, but for if your a girl, dont want to be called a dog (or dawg), or are looking to be called sexy. Also for boredom, entertainment, or to point and laugh at anyone who doesnt get it.
Girl: wow there is really so much upsexy in here
*boy playing xbox and not paying attention*
Girl: OMG theres upsexy getting all over your xbox!!
Boy*frantic*: huh? where? whats upsexy?
Girl: not much. how about you?