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Definition of Bump and grind
1. Noun. (idiomatic) A sexually suggestive dance involving exaggerated hip movements, especially a striptease dance. ¹
2. Noun. (by extension) A combination of movements resembling such a dance, as in road racing, whitewater kayaking, or exercising; any activity involving prolonged jarring or shaking. ¹
3. Verb. (idiomatic) To perform such a dance or such movements. ¹
¹ Source: wiktionary.com