In slang, JIT is a term mostly used in Southern U.S. regions, like Florida, to describe a young person, often a kid or teenager or inexperienced. It’s a casual way to refer to someone younger or less experienced. For example, someone might say, “That jit doesn’t know much about this.” It’s sometimes used playfully but can also sound slightly dismissive depending on the tone and context. The slang meaning differs greatly from the business term.

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