Definition from Wiktionary, the free dictionary
Alternative forms 
- gerble (verb)
gerbil (plural gerbils)
- (zoology) One of several species of small, jumping, murine rodents, of the genus Gerbillus. In their leaping powers they resemble the jerboa. They inhabit Africa, India, and Southern Europe.
- To rotate inside a monowheel or similar apparatus due to sudden acceleration or braking.
- (slang) To insert a small animal into the rectum of a person.