DRELLA (to Michel): Back off, Chevalier.
Drella is referring to French actor and singer Maurice Chevalier (1888-1972). He is best known for his signature songs, including Thank Heavens for Little Girls, from the 1958 musical film Gigi. At the peak of his career, he was the highest-paid actor in Hollywood.
When performing in English, Chevalier adopted a heavy “stage French” accent, although in everyday life he spoke fluent English with a slight American tone. Drella may be indicating that Michel is also “faking” his French accent.
The Annotated Gilmore Girls 
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