(British) Blustering and boastful, showing off with- out having the qualities to justify it. A commonly heard dismissive phrase, typically said by women about a loud or assertive man. There is a suggestion that this is a corruption of the more logical, but rarely heard expression, 'all mouth and no trousers', meaning full of talk but deficient in the sexual area. A less racy version is 'all talk and no action'. There is an analogy with other colourful expres- sions, now mostly archaic, such as 'all my eye and Betty Martin', meaning nonsense, and more abusive versions such as all piss and wind.

Oh him! He's all mouth and trousers, that one.