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when your level of boredom is so great, you spontaneously slap yourself in the face in the hope of having a fun idea.
"This guy was just sitting at the table across from me in the diner, then BAAAMM! he slaps himself in the face."

"Yeah dude ,probably was a boredom slap."

"Yeah afterward he started doing the macarena on a table."

by person with a name May 11, 2012
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