Active Camo 

The glowing blue orb power-up in the Halo series.
When you pick it up, for a limited time, you become invisible.
When you fire, while in active camo mode, your invisbility will temporarily go away, only to come back after a few seconds of not shooting.

OMFG. That homo keeps getting the fucking active camo, and assasinating me !!!!!
*breaks controller in half*
I HATE THIS GAME!!!!!!
DOCTOR OCTOGONOPUS....
BLARRGHHHHHHHHHHHHHHHH!

Active Camo by KoolKarlen July 25, 2009

active camo 

Used to describe the effect perceived (or rather, not) when an African-American fellow is photographed or encountered in a dark environment.

"I never saw the thing coming, officer! It... it blended in with it's dark environment, then, then my purse! It was GONE! WHAT WAS IT?!"

"I'll tell you what it was, Ms. McFinney... One of them... African Americans. Over the years they've evolved some sort of... active camo!"

active camo by Adam McDonald May 8, 2006

Active Camouflage 

An piece of covenant technology that renders users of it partially invisable. The UNSC captured a piece of active camouflage, and made their Spartan-II MJOLNIR armor able to integrate itself with the covenant technology. In the Halo game series, players can become invisable if they find active camouflage.

No wonder he was able to get behind our base... he had active camouflage.

Active Camouflage by Drüd October 19, 2008