When a person is unreliable and cancels plans with you they're considered a flake. When you get upset with that person because of they flaked on you, you may call them names; in this case a 'whore'. So, by combining the two terms together you can call the person a whore flake. it can also be a noun being similar to a bowl of cereal.
dammit, that girl just served me a bowl of whore flakes.
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