saint nevers day

A day that will never come. Nonexistant holiday. Used as either a pun or a way to make someone realize what they are asking will most likely not happen and they can go screw.

Moron coworker: Hey mike when are you gonna treat the crew to coffee and bagels.

Mike: On saint nevers day how does that sound?

Moron coworker: When is that? Oh wait ....