The song is a "schlager," a style of popular music common in Central and Eastern Europe during that era.
Stefan Voronov (1945–1974) was a prominent figure in Bulgarian pop culture before his untimely death in a car accident.
He was known for his roles in Bulgarian films such as Ptitzi i hratki (1969) and Lyubovna terapia (1987, released posthumously).
Besides "Chin-Chin," his repertoire included other popular songs like "Urok po tants" (A Lesson in Dance) and "Ima strana" (There Is a Country).