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To press together and open (the lips) quickly and noisily, as in eating or tasting.
(verb-transitive)
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To kiss noisily.
(verb-transitive)
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To strike sharply and with a loud noise.
(verb-transitive)
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To make or give a smack.
(verb-intransitive)
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To collide sharply and noisily: The ball smacked against the side of the house.
(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.