At the end of a statement that's crazy or intense involving something that happened whether it's really really good or terrible the response it u out. And you say it fast.
Andrew:Damn she said "come over it's just her and her girlfriend no parents are home, and that we gon have a lil fun ;)"
Andrews friend Josh: "damn... u out."
Alex: "I just won free vacation to bahamas for a week....."
Chris: "u out"