What does JJ mean?
Other definitions of JJ:
Professional workplace slacker.
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How to use the term JJ:
That person is a JJ.
More slang terms:
In the case of Super Smash brothers (a video game where famous Nintendo charaters duke it out). Your mains are your charaters your used to playing as, Thou most people only have one main charater per Smash game.
I am too sexy for you