Merger of the words Cadet and Corporal.
Used patronisingly towards Corporals undeserving of their rank.
Also used in lue of the Rank Lance-Corporal, when no such rank officially exists.
Origin in the Air Training Corp (UK).
Example One:
"You Cadet, you're now a Cadorporal, you get this rabble formed up and ready for my inspection"
Example Two:
Cadorporal: "You get this cleared up."
Cadet: "Yes Cadorporal."
Cadorporal: "What did you just call me?"
Cadet: "I called you Corporal, Cadorporal."