to mess up or ruin something, aka 'fucked up'. other alternatives, Flubbup, Flubbedup, Flub up, Flubbed.
Michael you fucking dipshit, you broke the clock!
sorry man, I flubbed up.
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Mess up. Make a mistake. Do something innocently that is in error, such as say the wrong thing.
He really flubbed up on that speech.
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