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The point where one cannot hold her their bowel movement, typically diarhea. The body stiffens up like a wooden board, hence the name 'boarding'.

Quick movements while boarding may cause one to shit their pants. Famously discussed by former Dodger's pitcher George Brett regarding an incident of food poisoning in the Las Vegas strip.
Mike and Dave both started boarding shortly after over-eating at McDonalds.
by UofPittEE July 20, 2009
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Mar 1 Word of the Day
One who has a mania for music.
I am a melomaniac.
by Larstait November 14, 2003
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planking but face up, laying flat on top of, across various objects face up
Jackson goes boarding across desks.
by beas1knees November 02, 2011
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See docking. But with more smegma...more...a little more...woe! TOO MUCH!!!
thats a lot of smegma there bill, your dick is awful cheesy...
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