giddyap

gid·dy·up

G0119300 (gĭd′ē-ŭp′) also gid·dy·ap (-ăp′, -ŭp′) or gid·dap (gĭ-dăp′, -dŭp′)interj. Used to command a horse to go ahead or go at a faster pace.
[Alteration of get up.]

gid•dy•ap

(ˌgɪd iˈæp, -ˈʌp)

also gid•dap

(gɪˈdæp, -ˈdʌp)

gid•dy•up

(-ˈʌp)

interj. (used as a command to a horse to speed up.) [1920–25, Amer.; informal pronoun of get up]