Tagging anyone in the back of the neck unexpectedly for doing something particularly stupid.

Commonly done by mothers.
Mom quickly dopeslapped billy for oogling Mrs. Kent's daughter thru the window.
by UA August 26, 2004
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a dopeslap is what happens when two clueless people try elaborate handshakes at the same time.
It is funny watching jesse and chris dopeslap each other.
by churchyard October 14, 2014
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