Green’s Dictionary of Slang

bong v.2

also bong on
[bong n.1 ]

(drugs) to smoke marijuana through a bong n.1

[Aus]Lette & Carey Puberty Blues 97: If we didn’t bong it [marijuana] we smoked it in a joint.
[Aus]Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Bong on. To smoke hashish or marijuana.
[US] in L. Stavsky et al. A2Z.