Green’s Dictionary of Slang

pop-pop n.

[echoic]

1. (US black teen) the noise of a gun being fired .

[US]Eazy-E ‘Neighborhood Sniper’ 🎵 on Wanted [EP] My A.K.47 I stand bold / rippin’ up shit with the fury of my gun shot / pop pop pow as I watch the muthafucka drop.

2. see poppy n.2 (1)