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It could mean subtly different things in different contexts.

Either it means that the person talks convincingly, and may even believe their own hype but is either misslead or wont follow through on their words with their stated action regardless of their intent OR more commonly it is used when someone talks like they know something or have some expertise on something--and again may even believe they do--and even have good intentions, but while they may be convincing their sentiments are nethertheless 'full of it'.

For example: Obama certainly "talks a good game", but whether he will have any follow through on his good intentions remains to be fully seen.

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16y ago

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