in the show "Seinfeld", the character Kramer uses this word repeated. It means lets go/ready to go.
Bill: do u wanna go to the movies?
Mike: giddy up
by Rock N Roll Bitch November 12, 2005
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said when somebody sexually turns you on, they make you giddy in the pants
He is so sexy, he makes me giddy in the pants.
by toee March 1, 2007
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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
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Someone who has made a small but silly mistake. Often used as the word nincompoop would be if it were directed towards yourself.
“I left the washing outside in the rain, oh I am a giddy goat!”
by Mr.GiddyGoat December 16, 2017
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