Green’s Dictionary of Slang

(Ling. Fr./Polari) the penis.

1963		T.I. Rubin Sweet Daddy 90: All ’cause she’s got a slot instead of a bagaga and a pair of boobies instead of balls.
1972		B. Rodgers Queens’ Vernacular 48: the penis [...] bagaga (fr It bagaglio = baggage).
2002		Juha ‘Polari’ 🎵 on Polari [album] Now me & the gang gonna be a boat load of men / lined up to unload in your throat. / How deep does it go? How hot does it get? / Mine went in dry but shit, it came out wet & drippin. / How’s your double dippin? / Can you fit me & Rex inside without rippin? / This salty sea cave wanna fill with foam. / Jarry this bagada, filiome.
2019		P. Baker Fabulosa 289/1: bagaga, bagadga a penis .