When posting on a forum, you submit a post only to find that someone has posted the same thing only seconds earlier.

v. the act of stealing, swooping, or snaking something. the person who has been ninja'd upon does not realize it for a little while.

1). Quick, stealthy appearance or escape.
2). Sneak attack from behind. In video games, often with a knife.

1)sudden dissapearance
2) quick movement from one area to another

after sexual intercourse the act of walking across the room taking off the condom and quickly spinning around and throwing said condom at the woman's face like a shruiken

to be extremely high yet act so sober that no one was able to tell the difference.