all mouth and no trousers

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all mouth and no trousers

Full of boastful, arrogant, or shallow talk, usually by a male, who then cannot deliver on his claims. A variant of "all mouth and trousers," meaning the same thing. Primarily heard in UK. He talks a big game, but when it actually comes to asking out a woman, he's all mouth and no trousers.
See also: all, and, mouth, trouser