What is Boon Dong?
A particularly enormous, salubrious penis.
Dong : Slang for a penis
Boon: Abbreviation for baboon
i.e. a huge gorilla dick. Synonymous with big bamboo.
"Well now, you got yourself a bona-fide boon dong there, ain't ye fellah?!"
See big bamboo, acorn dick, dong, junk