fortune cookie

Meanings

1. A type of hollow snack, common in westernized Chinese cuisine: a crisp sugary wafer containing a message on a narrow strip of paper, generally with a wise or vaguely prophetic message or random numbers usable in a lottery printed on the paper.
2. A quote-of-the-day feature (especially on *nix systems.)
3. The vulva of canine species.

Etymology

First attested in 1942 (see quotations below). The slang sense is from the canine vulva resembling the cleft shape of the snack.