finger-popping, adj. — Green’s Dictionary of Slang

finger-popping adj.

[the ‘popping’ or snapping of one’s fingers in time to the beat]

1. (US) enjoying music intensely.

1955		Metronome July 22: Lord Buckley [...] addresses this album of classics in bop talk to Hipsters, Flipsters and Finger Poppin’ Daddies.
1968		‘Hy Lit’ Hy Lit’s Unbelievable Dict. of Hip Words 15: finger-poppin’ – Snapping your fingers ’cause you are grooving to a sound.
1978		R. Price Ladies’ Man (1985) 176: Teenage hands, finger-popping hands.

2. dedicated.

1969		J. Crumley One to Count Cadence (1987) 28: The houseboys were all hard-core finger-popping black-marketeers.
2005		Policy and urban Design for Housing 🌐 It contained proposals from a variety of hipsters and flipsters and finger-popping daddy-o’s, who were purveying everything from asphalt to recycled aluminum.

finger-popping daddy (n.)

one who affects to enjoy music but lacks any real knowledge/understanding.

1959

H. Ellison ‘May We Also Speak’ in Gentleman Junkie (1961) 34: The kid wasn’t any finger-poppin’ Daddy, either. He knew his music.