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1.
When stoned people get paranoid about something that is not actually happening
Jason: Hey man I think that's the cops knocking on the door, flush the drugs!
Paul: Dude can you stop being so mellowdramatic, that's the kettle.
by Brever July 10, 2010
 
2.
Derived from two words.

1. Mellow - to be cool, calm, collective or light headed. Relaxed to the point of non-involvement. Totally Chillaxed.

2. Dramatic - An action that girls or menopausal or bleeding women perform when they're upset by a similar action that someone else performed.

Mellow dramatic is the opposite of Mello Dramatic
After being married to Liz(the huge drama queen) for 16 years, Hollis is the anti-type of Mello Dramatic. He is Mellow Dramatic.
by Bucky Tucker January 23, 2011
 
3.
Means melodramatic but is much better because it looks like yellow.
"I am so mellowdramatic today"
--"I bought a yellow shirt!"
by I.am.me.duh January 04, 2009