look up any word, like swag:
 
1.
A Legendary Ninja fictionalized in modern comics, manga, and literature. Mainly used as a stereotype or nickname for Anime Watchers or Otaku who are also Very proficient in some kind of Martial Art. The title of "Sazuko" first appeared in anime clubs arouund 2004 also when popular ninja anime series Naruto also started gaining popularity. The name was thought to be derived from the name Sasuke a character from the show Naruto but was later learned to be the name of a real person that practiced Ninjutsu.

Similar titles are "Narutard" or "Sasuke"
"Dude watch out he's a Sazuko"

"You act like a Sazuko"
by Gin-Kiba February 02, 2010