Translation: "My feet are tired."

I'm uncertain of its origin. I started hearing this phrase around 2002 or so from different people, then it was used by one of the soldiers in "Half Life: Opposing Force"

I originally took this to mean "I gotta take a DUMP!" But have been proven wrong , apparently. Nonetheless I still prefer my interpretation.

"dogs are barking" dogs actually refers to ones feet. It is unclear if the term barking means hurt or smell.