1. A term used by Edmond Honda, from the Street Fighter series of games, after he has defeated you in combat. Though it's exact meaning is unknown, it is believed to be an insult along the lines of, "kiss my grits" or "suck an egg"

2. A basic exclamation of excitement, sadness, anger, or nonchalants. The users tone of voice will determine the definition.
Sedrick: " Yo dawg, you done be filled up dat milks, didntchu?"

D. Abernathy: (disgusted head shake) "Koof koy."
by K. Tea Toad July 29, 2011
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