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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"
jcd by alleb32 August 21, 2011
Related Words
"yo i'm so bloated, jcd"
"stahp"
jcd by licoricepirate October 3, 2016
Tom J: Yeah then i him with cricket bat!
Jim H: JCD!
Tom J: I know, i regret it now...

omgohmdzjesus!christjesus christwtfwtd
JCD by Davvegemm March 18, 2009
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
JCD by rgrbthtseaht February 18, 2008
JCD, (JellyBeam Compulsive Disorder,) is the medical label given to those who have a uncontrollable urge to consume the online content of JellyBeamYT.
I was just sitting in my room when I started to feel an itch, one which could only be satisfied by my favourite YouTuber: JellyBeamYT. I hate my JCD, I can't go more than an hour without re-watching: 'BigK teamed with me and we fought' or 'CatRage escapes betrale.'
JCD by Jynicipt August 2, 2021

JCDGodot 

An enigma who appears once ever 1000 years, as his supposed upload schedule is has stated, commonly used as a symbol of a very long period of time to come back with great dread to all his viewers
Man, that guy just committed a JCDGodot coming back just to sell out to his patreon.
JCDGodot by TerribleTazer December 27, 2018