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1.
jcd
Just Calm Down. Used for when people maybe overreacting to something one may have said or used for when one gets too excited over a subject.
Girl 1: "OMG I LOVE THIS SONG!"
Boy 1: "JCD it is only a song"

Boy 2:"The Packers would whoop the Vikings ass any day!"
Boy 1:"JCD."
Boy 2:"I AM CALM"
by alleb32 August 16, 2011
 
2.
Jewish Community Day School- A pluralistic Jewish day school in Watertown, MA. Sometimes jokingly referred to as Jesus Christ Day School (JCDS), by the student body.
Wow, you go to JCDS? You must be going to Gann for high school!
by qwertyuiopasdfgghjkl June 30, 2013
 
3.
JCD
Jesus Christ Dude!

Tom J: Yeah then i him with cricket bat!
Jim H: JCD!
Tom J: I know, i regret it now...

omgohmdzjesus!christjesus christwtfwtd
by Davvegemm March 18, 2009
 
4.
JCD
Abbreviation of Jean Claude Darcheville, football player for the greatest team in Glasgow, Rangers f.c He also is in the knowledge, BJK, Big Jock Knew.
Did you see JCD the jcb scoring a hatrick against the tims?

Yeah, he is amazing, he most definately knew, like big jock
by rgrbthtseaht February 18, 2008