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1.
Definition 1- A sexy, tall 16/17 year old who's the CEO of Kaiba Corporation and has a condescending personality. He has a younger brother named Mokuba who's 11. Kaiba's first name is Seto, and his full name (Kaiba Seto) means "Sea-Horse-Shallows-Person". Kaiba enjoys duel monsters and is one of the best players in the world. He is Yuugi's greatest rival.

Definition 2- A certain someone's bishie (*coughcough*) (see definition 1).
D1- Kaiba is obsessed with defeating Yuugi in a duel fair and square.

D2- Better not kill Kaiba or a certain somebody will chase you forever until she catches you and murders you for destroying her bishie!
by Sarah Kaiba July 16, 2004
 
2.
one of the main antagontists of yugioh and yugi's biggst rival. he is obsessed with beating yugi and becoming the best after his defeat and loss of world champion to yugi
Kaiba's signature monster is his famous Blue-eyes White Dragon
by david September 28, 2003
 
3.
A character on Yu-Gi-Oh with a rather gay sounding voice.
Pound me harder, Yugi-boy
by Stinkoman February 17, 2005