To fuck up something important.
To be tactically inept at a game that requires skill.
To be clueless in important situations.
To use bad luck as an excuse for failure.
I can't believe I did a David Moyes today.

You're such a David Moyes at Chess.
by Juan it doesn't Mata February 3, 2014
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To completely mess things up/to start afresh and make a situation worse.
Things were going ok then he went full Moyes and f*cked it right up.
by Snafuscribe December 26, 2017
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To 'Moyes' something is to screw up beyond all comprehension.
"Can't believe we're out of the Europa after pulling a David Moyes."
by JHmackem March 20, 2018
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I played against Sunderland in FIFA 17, their coach was such a Moyes
by Come on, why not? November 20, 2016
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