Chops
By Sweetwater on Jul 19, 2005, 12:00 AM
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The word “chops” is used to describe a musician’s level of technique in terms of the ability to execute music physically on a particular musical instrument (and to negotiate chord changes). An example would be the lightning-fast technique of a guitar player. E.g., “Yngwie Malmsteen has great chops.” “Chops” is a slang term that has its roots in the jazz idiom, initially relating to horn players’ ability to hit high notes. (“Miles has got the chops…”) “Chops” in this case harkens back to its original 16th-century slang meaning of “mouth” or “lips.” The term chops is not used to describe the capacity to have good musical ideas, to phrase effectively, or to build a solo.
https://www.sweetwater.com/insync/chops/

This is about trading your soul to the Devil in exchange for musical skill. It's a common trope but is particularly associated with blues musician Robert Johnson.

"Robert Leroy Johnson (May 8, 1911 – August 16, 1938) was an American blues singer, songwriter and musician. His landmark recordings in 1936 and 1937 display a combination of singing, guitar skills, and songwriting talent that has influenced later generations of musicians. Johnson's poorly documented life and death have given rise to much legend. The one most closely associated with his life is that he sold his soul to the devil at a local crossroads to achieve musical success."
https://en.wikipedia.org/wiki/Robert_Johnson