English

Proper noun

X-Day

1. An annual celebration in the Church of the SubGenius parody religion, falling on July 5 and commemorating the prophesied end of the world on that date in 1998, when alien beings from "Planet X" were to have invaded.

See also

• X-Day (Church of the SubGenius) on Wikipedia.Wikipedia

Noun

X-Day ‎(plural X-Days)

1. Synonym of D-Day (The date of any major event planned for the future.)