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A "bj" is a newly founded acronym that is short for the term "bad joint". Bad Joint is originally used to describe something you think is cool. The more recently founded definition for the word "bad" is now used to call something or someone, sexy, hot, cool, or anything good. The word "joint" is an older southern word known to refer to a place or an object. Combining the two it creates an interesting, appropriate, way to say that something is cool.
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