When trying to respond to a comment on a chat room, only for someone to comment before you, making your comment lose it's originalContext. Depending on the intermediary comment, this can have some humorous results
Dave: Anyone wanna play The new X-Box Game?
Sanders: How about some Dick?
George: ^^ Yeah, I'd want in on that
Sanders: Lol, Gay!
Dave: haha, dude, you got ninjad!
To take something quickly and quitely without anyone noticing. Offen used in the online game WoW when a party member takes an item without the party's consent.
Tim: Dude you gotta see my new phone it's so boss.
*tim reaches in his pocket for his phone*
Tim: What the hell, who ninjad my damn phone?
Mike: oh dude I thought you knew I was looking at it like 5 minutes ago.
Tim: How the??
1. v. The past tense form of taking an item from a person without their noticing, usually right in their line of vision.
2. Used in the popular game "Halo" for xbox 360 when a player is getting chased down by another from behind, jumps backwards, and assassinates the enemy. (past tense)
when someone ninjas you it means they send you a chat on facebook saying either ninja, you've been ninjad, ect. knowing that are logging off right after it sends.
*kate opens up facebook chat and sends a message to john saying 'i just ninjad you' then logs off*
john: dang it she did it again
kate: hahaha he can never ninja me back...i must be too ninja