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1 definition by LisaBisa28

Best Friend of the Office; Your best friend at work whom you normally would not be friends with outside of work; A BFF, but only at work.
Lisa: "Hey Marlon, are you going to hang out with Jeff on Thursday night?"

Marlon: "Hell no, he is just my BFO. We don't hang out outside of work."
by LisaBisa28 April 14, 2009