What is Keitaro?
1.
The male land-owner of the Hinata Dorm in the Manga / Anime "Love Hina". Also an artist and a day dreamer who desperately tries to get into Tokyo University to fulfill a promise he made 15 years ago. Tends to get into many "pervy" situations with the female residents.
Keitaro got smacked by Naru for accidentally peeping while she undressed.
2.
Used for someone who is clumsy, perverted, or just plain stupid. In other cultures, it is used for someone who gets off on kissing turtles and stealing women's panties.
(Hint Hint: Love Hina)
My best friend is such a Keitaro!
See