Definition of giddy-up in English:

giddy-up

(also giddap)

exclamation

  • Used to get a horse to start moving or go faster.

    giddap
    • ‘I took hold of the rein and said giddy-up and headed for the highway.’

Origin

1920s (as giddap): reproducing a pronunciation of get up.

Pronunciation:

giddy-up

/ˈɡidēˌəp/