Literally "what you on". Can be used
two ways. Either meant to
see what you're doing, or used to see what you're trying to do (in terms of what your intentions are).
1: Wassup? Wyo tn?
2: Shit. Chillin prolly. Wat up?
1: Ima pull up in a few.
M: You're so damn
fine!!
W: Ah thanks, but... wyo?
M: I'm on u lbs, wyo?
W: I'm only on u. Let's link.