any of a wide variety of variously shaped bread rolls, usually leavened and slightly sweetened or plain, sometimes containing spices, dried currants, etc.
hair gathered into a round coil or knot at the nape of the neck or on top of the head in certain coiffures.
buns, Slang. the buttocks.
have a bun on, Slang. to be intoxicated:
Everyone at the party seemed to have a bun on.
blood urea nitrogen: the concentration of nitrogen in the blood in the form of urea, indicating kidney function.
Contemporary Examples

The Perfect Burger (Sans Bun) Deborah Krasner October 31, 2010
11 Best Monty Python Moments Natasha Bach November 19, 2013
The Appeal of Cinnabon Vodka and the Rise of Flavored Vodkas Daniel Gross November 21, 2013
My Big, Buttery Lobster Roll Rumble: We Came, We Clawed, We Conquered Scott Bixby June 6, 2014
Camel in a Can and 6 More Weird Canned Meats January 4, 2014

Historical Examples

The Happy End Joseph Hergesheimer
Ruggles of Red Gap Harry Leon Wilson
The King of Diamonds Louis Tracy
Peak and Prairie Anna Fuller
The Old Man in the Corner Baroness Orczy

a small roll, similar to bread but usually containing sweetening, currants, spices, etc
any of various types of small round sweet cakes
a hairstyle in which long hair is gathered into a bun shape at the back of the head
(slang) have a bun in the oven, to be pregnant

A state of drunkenness; alcoholic exhilaration: A bun is a light jag (1900+)
The buttocks; bum •Originally ”the tail of a hare, scut”; first seen applied to persons in Scottish poetry (1530s+)
A single buttock; cheek: a boil on my left bun (1970s+)

blood urea nitrogen

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