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1.
A person whose level of flakiness (i.e. unreliability, undependability, fickleness, etc.) is so extreme that it borders on magnitude of mental retardation.
First he says he'll call me right back, which he doesn't. Then he begs me to go out last Saturday only to bail out when I call him when he's late. What a flaketard!
by Raymond Dang May 08, 2006
 
2.
A whiner who posts rants on Facebook, who never calls back and invents ridiculous stupid ideas like "flaketard"
Yo T, why you such a flaketard beatch!
by Tiiisuuun May 07, 2010