1. Someone who is disconnected from reality or doesn't take life seriously; someone who lives in a fantasy world.
2. A homosexualoffensive 3. An unreliable person
4. "To flake out" - to give up, not perform work or not show up as promised
Those grown men and women dressed as superheroes at the convention were complete flakes.
San Francisco is like a bowl of cereal - full of fruits, nuts and flakes.
Don't flake out on me.