be all hat and no cattle

be all hat and no cattle

To be full of talk that is more impressive than that which one actually possesses or is able to do. Primarily heard in US, South Africa. He talks as though he knows more than anyone else, but he's all hat and no cattle.
See also: all, and, cattle, hat, no

be all hat and no cattle

tend to talk boastfully without acting on your words. US informal
See also: all, and, cattle, hat, no