be all mouth

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be all mouth

To be full of boastful, arrogant, or shallow talk without the ability to deliver on such claims He talks a big game, but when it actually comes to asking out a woman, he's all mouth.
See also: all, mouth

be all mouth (and no trousers)

tend to talk boastfully without any intention of acting on your words. informal
1998 Oldie What was the point of the Sitwells?…The image was the point, transcending mere achievement…The Sitwells were all mouth and no trousers.
See also: all, mouth

be all ˈmouth

(British English also be all mouth and (no) ˈtrousers) (informal) if you say somebody is all mouth, you mean that they talk a lot about doing something, but are, in fact, not brave enough to do it: Don’t be scared of her. She won’t hurt you — she’s all mouth.
See also: all, mouth