The superlative form of drippy; the most drippy or most inclined to drip.
From 'drippy' (drip + -y) + '-est' (superlative suffix), indicating the highest degree of drippiness.
The '-est' superlative suffix is one of the oldest features of English, inherited directly from Old English, which is why we say 'biggest' and 'happiest' rather than using 'most' for short adjectives.
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