Definitions

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

  • transitive v. To have sexual intercourse with.
  • intransitive v. To engage in sexual intercourse.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. Alternative spelling of bonk.

Etymologies

From boink, imitative of bumping or bouncing.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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  • "Was it a major boink-fest?" Gary Trudeau through Kim, Doonesbury.

    October 10, 2007

  • "Scientific Progress Goes 'Boink'!" by Bill Watterson (Calvin and Hobbes).

    January 29, 2007