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1.
rdc
abbreviation for 'really don't care'
when someone is boring you with useless information, or oversharing, simply reply 'rdc'
by statsman February 15, 2007
 
2.
rdc
Random Desperate Character

Someone no one knows that tries to join the club/activity
Hey guys, mind if I join?" "What an Rdc..
by Iinventedfobs May 04, 2011
 
3.
rdc
Relationship Defining Coversation
"Is Mary your girlfriend?"
"No, it's ambiguous. We haven't had the RDC yet."
by kingkongrevenge December 10, 2006