to make a short loud noise with your lips before or after you eat or drink something to show that it is good:
He drained his glass and smacked his lips appreciatively.
4British Englishinformalto hit someone hard with your closed hand [= punch]
smack of something
if a situation smacks of something unpleasant, it seems to involve that thing:
To me, the whole thing smacks of a cover-up.
smack somebody up
to hit someone hard many times with your hand:
Don't make me come over there and smack you up.
WORD FOCUS: hit WORD FOCUS: hit with your fist:punch, thump, bash with your open hand as a punishment:smack, spank, slap with a hammer:bang, hammer in order to get attention:bang, knock, tap, hammer accidentally:bump into, crash into, strike, bang, knock, collide (with) ➔ See alsohit
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.