What was Fred Flintstone's famous catchphrase?

Fred Flintstone's famous catchphrase is “Yabba dabba doo!” The exuberant shout is one of the defining sounds of The Flintstones and is usually delivered when Fred is celebrating, especially after work or a successful scheme.

The phrase is also connected to Fred's club life. In the original series, “Yabba dabba doo!” is revealed as the official cheer of the Loyal Order of Water Buffaloes, the lodge Fred belongs to with his neighbor Barney Rubble. The cheer helps tie Fred's personality to the show's comic parody of modern suburban and fraternal life.

The expression is sometimes written with hyphens or capitalization variations, such as “Yabba-Dabba-Doo!”, but those are stylistic differences rather than different answers. It should not be confused with “Wilma!”, another famous Fred exclamation, or with the similar-sounding catchphrase associated with George Jetson. Voice actor Alan Reed is widely credited with shaping the phrase during the show's production.