This is the coolest of cool, the sweetest of sweet.
Offen used in gaming situations where
a combo or other impressive move was used on an opponent.
Sometimes used in
the real world to describe somting "sweet" or "wicked".
"Dude, did you see
my rocket+nail+
rail gun combo frag, it was totally ninja!"
"Hard|
OCP and Slashdot are both totally ninja!"