Dan from Jacksonville, Florida, grew up in South Louisiana, where speakers of Cajun French say Garde de donc! to mean "Well, would you look at that!" or "Can you believe this?" The phrase is used to point out something foolish or surprising. The same idea may be rendered as Mais garde donc or Garde donc or Garde mais donc, the garde coming from the French word meaning "look at" and the donc meaning "there." It's unrelated to the term gaga, which originates in French hospital slang gâteux, referring to someone who lacks all their faculties. http://waywordradio.org

1630-Caller-Dan-Garde-De-Donc

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