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.

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