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1. RDJ
Robert Downey Junior, one of the most gifted actors of all time.
RDJ is awesome. Simply awesome.
2. rdj
Short for "Robert Downey, Jr."
Guy: "Hey did you see Iron Man yet?"
Girl: "Yeah, I saw it three times because RDJ is so hot."
3. RDJ
abbreviation for Robert Downey Jr.
Dude: Who is the principal in the movie Charlie Bartlett?

Chick:Dude, RDJ. C'mon?
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