Definition & Meaning of "dill pickle"in English

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

"Dill pickle" as a slang term for a sour, grumpy, or unpleasant person comes from the literal food, a pickled cucumber flavored with dill, which has a sharp, tangy taste. It emerged in informal English in the early to mid-20th century as a playful metaphor: just as a dill pickle is puckery or sharp, a person labeled this way is irritable or disagreeable. The term is mostly humorous and affectionate, used in casual conversation or light teasing, and is context-dependent—sometimes mildly critical but rarely deeply offensive.