What is slack-jawed idiot?

Anyone posing for a clickbait Youtube thumbnail.

No that's not a good pose you slack-jawed idiot.

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slack-jawed idiot - video

Slack-jawed idiot - what is it?

A lazy, shady character that's unconsciously incompetent.

He think's he's "the man", but everyone else sees him as being a fool.

Just look at mike! That slack-jawed idiot doesn't even have a clue!

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