feel like ass- usually occurs when being sick or the morning after after a kick-ass party. feeling like ass is to feel down, shitty, etc..
hang-overs, symtoms of the flu and cold and a massive puke factor are ways of feeling like ass; " hey man we should go out and party tonight, i heard they're going to have some sick shit there" " nah.. i'm good, i've got a hang-over from last night and i can't stop barfing. i feel like ass."
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.