Definition of XXXX in English:

XXXX

(also four-X, Fourex)

noun

British
informal
  • Used as a humorously euphemistic substitute for a four-letter swear word (usually ‘fuck’) in "not to give a XXXX" and variants: not to care at all, not to give a damn.

Origin

1980s; earliest use found in The Sunday Times. From the trademark Castlemaine XXXX, a brand of Australian lager, punningly after the use of X to replace an unknown or suppressed name, number, etc.

Pronunciation

XXXX

/ˈfɔːrɛks/