Someone or something that flakes; a person who is unreliable or makes commitments they don't keep.
From 'flake' (to break into flakes) + '-er' (Old English agent suffix). Modern slang sense developed from 1960s-70s counterculture.
A 'flaker' in slang is someone who 'flakes out'—drops commitments like flakes dropping from pastry—but the word secretly carries a geological metaphor from stone tool making!
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