To grovel to one's superior with no regard to dignity or shame. One who performs the act of groveling.
Hey Bill, look at Bob. He's always in the boss' office smacking ass. He's too lazy to get that promotion.
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.
-one who did a stupid thing, and now you all fucked
Jake!, you smack ass, you trying to get us caught or something??