A childhood condition, usually temporary, in which the afflicted child believes him or herself to be a ninja. This condition typically passes after the child hits puberty and discovers the opposite sex.
Guy 1: Hay bob hows it going.
Bob: Not too bad Guy 1 but my son has ninja syndrome and keeps hiding and throwing stuff at me.
Guy 1: Well thats what you get for deciding to have kids.
Bob: I didn't decide, my wife just didn't get that abortion she said she was
Its when you take a big solid shit kicking its way out of your ass, the head sticks out of the water and you think (i'm gonna need a plunger to beat this fucker down), thers no need to wipe, and when you fush it disappears in a cloud of brown mist!
The ninja shit almostmade me shit my pants, i got it out and went to beat it down with a plunger and the fucker disappeard in a cloud of mist!
One who is well skilled in the art of the Pump Shotgun in games such as Counter Strike, and jump around while killing people in the air...much like a ninja. Thus the term, Pump Shotty Ninja.
*Reading book*
*Ninja Bitch steals money off dresser*
*Person stops reading book and looks at dresser and the money is gone*
Person: DAMN THOSE NINJA BITCHES! THEY DID IT AGAIN!