An insulting term used against someone, particularly a heavier set individual, who is being unreasonable, condescending, ignorant, or just a straight up Bitch. Being labeled a Beluga Susan is the equivalent of being called a "Fat Cunt" but in a more proper, discreet manner. This word is commonly used in work places, where an employee wants to call a fellow colleague a "Fat Bitch" but without getting in trouble.

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