What is the meaning of expression 'hitch in your giddyup'?

[Oinas]

English Language Tests, Intermediate level

ESL/EFL Test #296 "English Slang Idioms (18)", question 6

"What's the matter, Fred? Do you have a ......... in your giddyup? You look tired and a little sick," Gill asked his friend.

(a) wrench
(b) hitch
(c) cinch
(d) thorn

English Language Tests, Intermediate level

ESL/EFL Test #296 "English Slang Idioms (18)", answer 6

"What's the matter, Fred? Do you have a hitch in your giddyup? You look tired and a little sick," Gill asked his friend.

Correct answer: (b) hitch

Your answer was: incorrect
"What's the matter, Fred? Do you have a thorn in your giddyup? You look tired and a little sick," Gill asked his friend.
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What is the meaning of expression "hitch in your giddyup"?

[Linda]

People use this when they aren't feeling well or when they're cranky (in a bad mood).
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