Ninja Mode 

When you're on Live Messenger and you tell people you're signing off then you change your status to "Appear Offline"...like so people think you have signed off but you're actually lurking in the msn shadows, waiting to pounce when someone cooler signs in.

Rach: "Here how can you be talkin it says ur offline"
Gill: "It's cool im on ninja mode so nobody else annoys me."

Ninja Mode by Gilly_Willy_aye December 25, 2008

Ninja Mode 

When a person, or group of people for that matter, enter a social establishment or gathering, with the intent of getting inebriated without the social and relationshipial backlash of having ones photo's tagged on Facebook.

Joe "Dude lets hit up that crazy rage out in Hutchinson"
Jack "No way dude, my GF will creep on my wall and see me tagged with a bunch of random hotties"
Joe "Dont worry about it, we'll go Ninja Mode"

Ninja Mode by Pubes from JTOWN February 10, 2010

ninja mode 

A mode in which one immediately crouches in the fastest and quietest way possible.

Just chill guys, just chill. Take a break... Ninja mode

ninja mode by Dream Team Camp August 31, 2013

Ninja Boss Mode 

Any sudden appearance of luck in the online gaming society that grants you multiple killstreaks or higher ranked session score.

I went Ninja Boss Mode in MW3 last night, ended up 3 kills to 42 deaths!

Ninja Boss Mode by NinjaBoss24_7 October 30, 2012