Gyuunyuu 

Word commonly used to express someone who is "ninja awesome".

"That guy must be a Gyuunyuu.. What a guy.."

Gyuunyuu by Renegade Jesus May 4, 2006

Gyuunyuu 

Japanese for milk.

Not a ninja, nor a ninja rank.

Ninja ranks are as Follows:

Kage
Jounin
Chuunin
Genin

Incorrect use:
That ninja is gyuunyuu.

Correct use:
Gyuunyuu and cookies make japan santa happy.

Gyuunyuu by LOhateVE July 23, 2006