Definition from Wiktionary, the free dictionary
merguez f (plural merguez)
- (slang) A car that has been modified—as by filing away its engine number, or including components from different cars—to make it harder to identify or to conceal damage from an accident.
- (slang, by extension) A seemingly normal transaction that later turns out to be a scam.
- “merguez” in le Trésor de la langue française informatisé (The Digitized Treasury of the French Language).