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An unreliable person. A procrastinator. A careless or lazy person. Dishonest and doesn't keep to their word. They'll tell you they're going to do one thing, and never do it. They'll tell you that they'll meet you somewhere, and show up an hour late or don't show up at all. Also spelled "flakey", or "flake" in the noun form.
She told me she would send me her pictures, but it's been 3 months and she hasn't sent me shit. She's flaky as hell.
by Theo Huxtable October 03, 2005
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2
Someone who cancels plans that were set for a while.
Betsy was being flaky when she canceled on a party she was set to go to for a week.
by Gzink January 12, 2017
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3
Unreliable, characterized by not following through on agreed plans.
He's a straight shooter with upper-management written all over him.

Ooh, I'm gonna have to go ahead and disagree with you on that. He's been acting real flaky lately.
by 6060606060 January 07, 2006
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6
A person who is very unreliable. They commit to do things but rarely follow through. They will seem sincere when they make a promise. And perhaps they honestly believe they can deliver. But don't be fooled, trusting a flake will only cause you frustration and heartache when they frequently let you down.
Andy from Hereford promised to help with the kids during the holidays, but forgot to organise his diary. Andy is flaky.

Andy from Hereford promised to spend the weekend with you, but would never commit to a date. Andy is flaky.
by WearyGirlfriend December 19, 2017
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7
being socially adaptable in a way that compromises your self-worth.
Gina is a flaky person because she seemed so real talking to me at my place, but then she was ignoring me around her friends on the basketball team.
by Calvin K. February 15, 2007
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