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There are 2 results of your search for choc2.
choc1
Used for 'wog' (in sense of an Italian, etc.) coming from the rhyming slang with chocolate frog = wog (I'm half wog myself!). Also, choco.
choc2
Academically gifted student. May derive from 'Chocolate-lips' or 'Brown-nose': Ask Dave for the answer, he's a choc; You're such a choc!