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Similar to "Giddy Up".

While giddy up means "let's go", "let's get it started", "you bet", etc...

"Giddy Down" is referring to a more sexual "let's go" or "let's get it on!"
Kate: "Would you like to come inside?"
Roy: "Giddy down!"
by Royfud May 12, 2009

Words related to Giddy Down

bone fuck get it on giddy up sex