- (used colloquially) having the relationship of friends or pals
- (used informally) associated on close terms; "a close friend"; "the bartender was chummy with the regular customers"; "the two were thick as thieves for months"
- Chummy is a given name, and may refer to: * Chummy Broomhall (born 1919), American cross country skier * Chummy Fleming (1863-1950), pioneer unionist * Chummy MacGregor (20th century), American jazz keyboardist
- friendly, familiar, or on intimate terms
- Generic slang for an object which has no official nautical name