soup up [sth], soup [sth] upvtr phrasal sepphrasal verb, transitive, separable: Verb with adverb(s) or preposition(s), having special meaning, divisible--for example, "call off" [=cancel], "call the game off," "call off the game."
slang (enhance: an engine, etc.) (俚语)
加强…，加大（马力）
The car had been souped up with twin exhaust pipes and a fancy spoiler.