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It's an acronym, which stand for "fuck a box of rocks." It's something you say to those who are holier-than-thou and never, ever wrong - and also have time on their hands to criticize anything that inconveniences them.
"Those stupid Race for the Cure 3 Day-ers block traffic and make me late to things."

"Know what? Go FABOR."
by heyitsH November 25, 2011
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