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When the attractiveness of a person makes you treat them more favourably than the average; sometimes to the point where you might act unnaturally, immorally, or differently from the usual in a social situation/setting.
Friend: “Since when were you nice enough to give away your lunch to a stranger?”

You: “Oh well, I don’t really regret it. Beauty bias I suppose.”
by Oddmammal February 19, 2018
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