broom, n.⁴ — Green’s Dictionary of Slang

broom n.⁴

[it ‘sweeps the street or room clean’]

(UK Black) a shotgun.

2015		150 ‘4 Door Truck’ 🎵 Get a man down with the broom, one hand ting boom, boom, boom.
2015		B.T. ‘Came in da Room’ 🎵 Like came in the room with a broom / Face all over the room.