Superlative form of 'goofy'; the most silly, foolish, ridiculous, or odd (among three or more things).
From 'goofy' plus the superlative suffix '-est' (used for the highest degree, as in 'biggest,' 'fastest'). The '-est' suffix comes from Old English and is used when comparing three or more things.
Notice that to make 'goofy' into its superlative we just add '-est' and drop the 'y'—this rule (change 'y' to 'i' before adding '-est') is one of the most reliable patterns in English word formation!
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