goldfish

Short definition from Wiktionary

Noun

1. 1
   A type of small fish, Carassius auratus, typically orange-colored.
2. 2
   A person with an unreliable memory.
3. 3
   Nonstandard form of Goldfish (“a small orange saltine-like cracker shaped in the form of a fish”).
4. 4
   A small orange saltine-like cracker shaped in the form of a fish.