Noun
(euphemistic) The word shit, regarded as a vulgar or taboo word.
(euphemistic) The word slut, regarded as a vulgar or taboo word.
(euphemistic, UK) The word spastic, regarded as an offensive or taboo word.
(euphemistic, US) The word spic, regarded as a vulgar or taboo word.
Any word beginning with s that is not normally taboo but is considered (often humorously) to be so in the given context; for example, socialism.
Source: en.wiktionary.orgDan Walters says Gov. Jerry Brown's use of the S-word was out of character for a governor more known for throwing around "snippets of Latin." Source: Internet
If I say "the S-word," you know what I'm talking about. Source: Internet