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Definition of Souped-up
1. Adjective. (context: horse racing cant) of horses injected with something to make them run faster or change their temperament (19th-early 20th century) ¹
2. Adjective. (context: US Navy slang) drunk ¹
3. Adjective. (context: of an engine, a motor vehicle or another device) modified for higher performance (likely derived from the horse-racing term) ¹
4. Adjective. (context: Rhode Island Massachusetts Connecticut slang) excited ¹
¹ Source: wiktionary.com