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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?!"
by heathenchimp April 21, 2009
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Apr 21 Word of the Day
I've been jabbed
by Francesco II March 20, 2021
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