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An exclamation, usually mean spirited, that implies someone has made a mistake or misfortune has befell them.

Usually, it is used as a means to 'kick someone while they are down'

Buns can also be substituted for certain other slang terms. For example, a person can say "my buns" implying the same thing as "my bad."

The term first became widely used in the New York area and has since spread west.
EX 1:

GB: Dashiell and Danny stole my subway sandwich and even my fork!


EX 2:

Ariel: Did you buy me a cookie like you promised?

(Person who was supposed to bring cookie): Oh I forgot, my buns.
by Bxsciguy February 27, 2010
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