noun, verb, adjective: racial slur directed towards asian people.
No technical definition applies.
Pham: "hai mang dit yu finish your chem hw, I need yu notes ^_^ ??!"
White kid: "Buk-Fin!!!"
Pham: *Stares blankly* *Walks away*

Old gook cuts you off, present the finger and scream Dol Mah, BUK-FIN!!! out the window
by Lollipop man Daz May 5, 2009
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