Top Definition
Head of a Yakuza family, basically a japaneese counterpart to a don(head of Italion/Siilian mafia), the oyabun is the father figure(oyabun means father in japaneese), supior to the Waka-Gashira(second in command).
Bring this cocksucking screw-up to the Oyabun and kiss his left pinky-tip good bye.
by Patrick SW June 28, 2006
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