Meaning: an unreliable person who says they'll do something, but then doesn't do it
- Lenny's such a flake! This is the third time he hasn't come after we'd planned to meet.
- John called in sick again today. He's such a flake.
Variety: This is typically used in American English but may be used in other varieties of English too.
Lizzie said Chrissie was a flake because she
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Contributor: Matt Errey