"souped-up : (horse racing, cant) Of a racehorse: injected with a substance to make it run faster or..."

“souped-up : (horse racing, cant) Of a racehorse: injected with a substance to make it run faster or to change its temperament.
(road transport, slang) Of an engine, a motor vehicle, etc.: modified for higher performance.
(United States Navy, slang) Drunk, intoxicated.
(US (chiefly Connecticut, Massachusetts, and Rhode Island), slang) Excited.”

- https://en.wiktionary.org/wiki/souped-up#English

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