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When someone wedges something about the size of a 1 foot long 2 x 4, the long way into some's tail bone, or even when a skateboarder takes a spill and the one side of the board goes into their tailbone.
"Hey did you see that skater?"
"Yea man he completely got guardrailed"
"Man I hate guardrailing"
by LTD36 (second profile) February 23, 2008