Slang term used by guys to describe a hot girl they're with who's way out of their league.
They miss her all the time and have to chat with her every day either by text or MSN Messenger to make sure she's still feeling sexy and interested in them.
Joe - "You getting it on with anyone at the min mate?"
Mark - "Hell yeah, I'm still on it with that sexy messenger I was telling you about! That shorty is way outta my league"