Drumming Fingers is caused by repeatedly strumming your fingers on a guitar in the beginning stages of learning how to play. (Adjective) Descriptive name of indented lines on the tips of the fingers; where the strummer used them the most. Fingers as a (Noun) describing the adjective
Jamie was playing her guitar for hours. Low and behold, she ended up with Drumming Fingers again. I’ll bet she will be careful next time and wear guitar gloves.