B-word Definition

noun

(euphemistic) The word bitch, regarded as a vulgar or taboo word.

Wiktionary

(euphemistic) Refers to any various taboo words beginning with b, such as bastard or bugger.

Wiktionary
Any word beginning with b that is not normally taboo but is considered (often humorously) to be so in the given context.
Wiktionary
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