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2.
Traditionally a word used to describe a famous Indian curry, this term of phrase is now being widely used as a way of describing a womens vagina among young adults between the age of 18 and 30 in Kent, Surey And Sussex.

And Bill shouted to Sean " Oi! show us your mother's Bhuna"

"she had the smelliest bhuna I've ever come across!"

Craig intimatley asked his girlfriend to "show us your Bhuna"
by Nicholas Beckingham February 16, 2007
 
1.
An alternative way to say "Spliff" or "Joint".
But it can also be used as an insult or a joke. It all depends on how you use it.
Example 1: "Let's go smoke a big phat Bhuna!"
Example 2: "You're an actual Bhuna, you "
by Poop2heavenCP October 24, 2014