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1.
Commonly used in Charleston, SC. It means butt (derriere). Boonkey is a Gullah/Geechee word.
Gullah/Geechee: "Gaaareed dat gurl dere got a big ol' boonkey on she!"

Translation: Wow, she has a huge butt!
by dmwinthrop May 03, 2010
 
2.
the act of recieving and engaging in sexual relations with a female. usually a hot one.
"hey girl, let me get a milkshake on the freesky and some boonkey."

"bitch i want some boonkey, NOW!"
by stapleboy43594 March 09, 2009