'S Not Bollocks

Mistakenly identified as a swear word, "bollocks" was in fact ruled as not being obscene after the Sex Pistols famously used it in their début album, Never Mind the Bollocks.

Testimony in a resulting prosecution over the term demonstrated that in Old English, the word referred to a priest, and could also be used to mean "nonsense" (see wiki).  Defence barrister John Mortimer QC and Virgin Records won their case.  :o)