Examples:

• You know what your problem is? Arrgh! All mouth and no trousers!
• He talks a big game, but when it actually comes to asking out a woman, he's all mouth and no trousers.
• It's certainly not all mouth and no trousers from me.
• He’s all mouth and no trousers. If we put up a united front against him, he’ll crumble.
• In the end they seem to have been all mouth and no trousers.
• Newark was its big chance to show it wasn't all mouth and no trousers - and blew it.
• A growing sense that it's all mouth and no trousers.
• And her fun skirt pays lip service to the saying 'all mouth and no trousers'.
• They tend to be all mouth and no trousers, or rather, all packaging, dire content.