Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adv. Slang Squarely; directly: stood smack-dab in the middle of the freeway.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adv. Exactly; directly; precisely; dead-center.

Etymologies

smack1 + dab1, with a sudden contact.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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