Flub up is an informal slang phrase meaning to make a mistake, botch something, or mess up — to execute something poorly through clumsiness or misjudgement.
Flub up is an informal slang phrase meaning to make a mistake, botch something, or mess up — to execute something poorly through clumsiness or misjudgement. A variant of 'flub' (to bungle or blunder), the 'up' adds an intensifying particle that is characteristic of American verbal compounds ('mess up,' 'screw up,' 'foul up'). Register is informal and mildly self-deprecating; it describes a mistake without the harshness of 'screw up' and with less profanity than 'fuck up.'
He flubbed up the introduction so badly that the speaker had to reintroduce himself from scratch.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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(slang) To flub; to botch or mess up.