1 definition by mcabbyshipper

A slap upside the back of the head usually done to someone who did or said something stupid. It was invented by Leroy Jethro Gibbs.
DiNozzo: "An assisted suicide of a suicide bomber whose suicide was before his suicide bombing. It's like how much wood can a woodchuck chuck if a woodchuck could chuck..."
Gibbs gibbs slaps him.
by mcabbyshipper January 17, 2013
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