smack

Concise Oxford English Dictionary © 2008 Oxford University Press:
smack1

▶noun

• 1 a sharp blow or slap, typically one given with the palm of the hand.

  ■ a loud, sharp sound made by or as by such a blow.

• 2 a loud kiss.

▶verb

• 1 hit with a smack.

• 2 smash, drive, or put forcefully into or on to something.

• 3 part (one's lips) noisily.

• 4 archaic crack (a whip).

▶adverb (Brit. also smack bang) informal

• 1 in a sudden and violent way.

• 2 (N. Amer. also smack dab) exactly; precisely.

– phrases
a smack in the face (or eye) informal a strong rebuff.

– origin C16: from MDu. smacken, of imitative origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
smack2

▶verb (smack of)

• 1 have a flavour or smell of.

• 2 suggest the presence or effects of.

▶noun (a smack of) a flavour, smell, or suggestion of.

– origin OE smæc ‘flavour, smell’, of Gmc origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
smack3

▶noun Brit. a single-masted sailing boat used for coasting or fishing.

– origin C17: from Du. smak, of unknown origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
smack4

▶noun informal heroin.

– origin 1940s: prob. an alt. of Yiddish shmek ‘a sniff’.