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boink(boingk) Vulgar Slang
v. boinked, boink·ing, boinks
To have sexual intercourse with.
To engage in sexual intercourse.
[From boink, imitative of bumping or bouncing.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.