A ritual suicide practiced by samurai in Japan, usually because he has brought shame and dishonor to himself. This might have resulted from failing to protect his master, or otherwise breaking the code of bushido, "the way of the warrior". The soon-to-be-deceased kneels with a short sword in both hands, and disembowels himself. Immediately after this, the sepuku assisant, known as the kaishakunin or "second", beheads the person with a sword. The ritual goes into great detail about washing and dressing, last words, etc.
by midget_rodeo August 19, 2006
Sepuku is the act of commiting Honorable Suicide. A defeated samurai warrior would kill himself before allowing his opponent the honor of finishing him off. Also See: HaraKiri.
by William March 10, 2005
I committed sepuku because I think "Seppuku" is actually spelled "Sepuku." Also, possum tastes great and I wear pants on my head.
by NotBobJohnson July 10, 2008
Sepuku is when a ninja butters or greases up a frisbee,bends in in half and inserts it into his mouth.
by Daric April 25, 2006