(n) one who refuses to do anything benificial with their time
Na man, i got shit to do. I gotta smackass from at least 12-4. Yeeeahhh
however--there is an alternate meaning to be used ONLY when it's REALLLLLY good.
good: we played a smack-ass game of poker last night and my boyfriend walked with the pot!
Im talking to you, smack ass. Didn't I tell you to bring my coffee in here by 8:00 a.m.? It is now 8:10 and I don't see my cup on my desk.