From Longman Dictionary of Contemporary Englishsouped-upˌsouped-ˈup adjective TTCa souped-up car has been made more powerful
Examples from the Corpus
souped-up• a souped-up gray Chevy• Then we get the young yobs, driving souped-up Minis and Capris.• Even above the sound of their own engine she could hear the drumming beat of Oscar's souped-up motor.• Using souped-up scanners and antennas, thieves station themselves near mobile phone callers. 