Green’s Dictionary of Slang

bong n.2

[? echoic of the supposed noise of tapping an empty head]

(UK juv) an eccentric.

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OnLine Dict. of Playground Sl. 🌐 bong n. 1) a mentler.

In compounds

bonghead (n.)

(US) a fool.

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[US]E. Hoagland Cat Man 177: ‘You don’t have to be a boss!’ ‘Hell, I won’t be, if guys like that stupid bonghead out there are all I can get’.