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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."
by xjgfmgmn June 27, 2008
 
1.
RDJ
Robert Downey Junior, one of the most gifted actors of all time.
RDJ is awesome. Simply awesome.
by Lil' Jul June 27, 2008
 
3.
RDJ
abbreviation for Robert Downey Jr.
Dude: Who is the principal in the movie Charlie Bartlett?

Chick:Dude, RDJ. C'mon?
by piratedayenthusiast April 05, 2010