Top Definition
A day of celebration of LeBron James' talents in which individuals leave the work day 12 minutes early. Initially celebrated on June 13th, 2011- a day after LeBron James failed to show up to work in the 4th quarter for the sixth game in a row against Dallas.
Ryan: Hey man, you staying till 5?

Ross: No dude, It's LeBron James Day. Work ends 12 minutes early today.
by rah3 June 13, 2011
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