Top Definition
a word used to yell at people for no reason, ussually out of a moving car to a person walking along the street, the closer and louder u are to the person the better!

(it is not an insult, although it alsois not a very nice greeting)
BOB-"hey look at that guy on the sidewalk"

Joe-"LEFTACON!!!"
by Tyler Holt January 22, 2007

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