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Definition of Pump and dump
1. Noun. (finance) A form of financial fraud where the fraudster buys stocks cheaply, generates artificial excitement about those stocks to create a temporary price increase, then sells the stocks before the price goes back down ¹
2. Noun. (slang) A situation where a person has sex with a partner on a single occasion, without immediate intention of further contact or pursuing a serious relationship. ¹
3. Verb. (transitive slang) A situation where a man has sex on a single occasion, without intention or prospects to see or contact the women in the future, or engage in a serious relationship. A form of one night stand. ¹
¹ Source: wiktionary.com