Definition & Meaning of "cockup"in English

What is the origin of the term "cockup" and how is it used?

Cockup is a slang term that appeared in mid-20th-century British English to describe a big mistake, blunder, or something done badly. The term likely comes from "cock," a crude word for the penis, combined with "up," emphasizing that something has gone wrong—though it is metaphorical, not sexual. Historically, it was informal and mildly vulgar, used to criticize errors or failures. Today it remains informal and slightly crude, commonly used in casual speech or writing to describe mistakes but generally avoided in formal or polite contexts.