Present participle of 'bop': the act of dancing rhythmically to music, or lightly hitting something; as an adjective, lively and energetic.
From 'bop' (onomatopoeia) + '-ing' (gerund/present participle suffix). The gerund form can also be used as a noun or adjective in various contexts.
Bopping emerged from bebop's fast, syncopated rhythms that required movement—it's one of the few dance terms that's actually onomatopoetic, mimicking the sound of the music itself!
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