Literal translation
to make a shitload, a blunder
Meaning
to make a blunder
Explanation
The verb caga, to relieve oneself, carries nothing vulgar in Provençal and has developed common figurative uses. A cagado, literally the product of that action, figuratively names the outcome of a blunder, from a small slip to a full disaster, since to fail is a usual derived sense of the verb. It fills a gap in everyday French, which has no truly popular word for the result of a botched action.