Definition & Meaning of "all hat and no cattle"in English

What does "all hat and no cattle" mean in Southern US slang?

The structure combines "all hat" (wearing a cowboy hat, implying a rancher or tough persona) with "no cattle" (lacking the actual livestock or experience to back it up), forming a vivid metaphor for empty posturing. It is used in the Southern and Western United States to describe someone who is boastful, arrogant, or puts on a tough or knowledgeable front but has nothing to back it up. People typically say "He talks a big game, but he's all hat and no cattle."