meaning "what do you mean?"
it is a shortened version on "what are you going on about?" or "what are you talking about?"usually used
when someone is not making sense for extended periods of time or if you feel like
you've missed something.
can be lengthened to show complete and utter
knobhead: dude. i totally just pwned that n00b. i asdfghjkl; the ask;nfw. fo shizzle my nizzle dizzle.awesome
: what you on about?example
knobhead: so, tomorrow, then?awesome
knobhead: we can go and you can meet them, yeah?awesome
person: what you on about?example
Gavino Free(roosterteeth): what you on about?