-A phrase used to politely and indirectly refuse a lame or unwanted invitation given by a friend or stranger without totally blowing them off in their face or over the phone.
FRIEND: "Hey the guys and I are going to get a poker game going tonight, $5 buy in, are you gamed?"
YOU: "Oh really? dude that sounds legit, I'LL SEE WHATS UP because im kinda tired."
1. an expression of approval and thanks for a good deed, OR, 2. can be used in sarcasm to show disinterest in someone's actions or feelings
1. Miss Utility: "I'm not wearing any panties."
Tito: "That's whats upgood lookin out!"
or
Danny: "I got laid off today. I need to look for a new job."
Tito: "That's whats up good lookin out?