Made fit or suitable; equipped or prepared, often with a humorous or informal tone.
From 'fit' plus the suffix '-ified' (or '-fied'), which means 'made into' or 'given the quality of.' Related to words like 'fortified' and 'glorified,' this appears to be a back-formation or informal construction.
This word is delightfully informal and probably invented by speakers—combining 'fit' with the popular '-ified' ending creates something that sounds funny precisely because it breaks normal word patterns.
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