Informal term meaning excellent, exciting, or performing exceptionally well. Can also be a present participle of 'rock,' meaning to move rhythmically or play rock music.
Derived from 'rock' in its musical sense, which emerged in the 1950s from 'rock and roll.' The slang usage meaning 'excellent' developed in the 1960s-70s, dropping the 'g' in informal speech to create a more casual, energetic expression.
The transformation of 'rock' from a geological term to a musical genre to a general term of approval illustrates how American slang often draws metaphors from popular culture. The dropped 'g' in 'rockin' reflects a common feature of casual American English that signals informality and group membership.
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