People who often stay invisible to IM friends.
Dude1: Dude! Your ex was definitely online last night. Where the hell were you?
Dude2: I know! I got so nervous I decided to play invisibee for a night.
Adjective to describe something that makes you go "oooooh".
I saw an Merc SLR the other night. It was so friggin' oooh-some!