1 definition by Cosmic Twist

Halo 3: ODST (initially named Halo 3: Recon) is a standalone expansion for the first-person shooter video game Halo 3 Players assume the roles of human UNSC soldiers known as Orbital Drop Shock Troopers (ODSTs) during the events prior to Halo 3.

It is said to be released at September 22, 2009. (Although they can always change the release date at anytime.) You can pre-order it at your local video game store (ex. Game Stop, EB Games etc.) and if you do then there will be a code to redeem Sgt. Johnson so he is playable in the game mode "Firefight."
Guy 1: Hey man, I heard that one game Halo 3: ODST is gonna be awesome!!

Guy 2: Yeah dude i've seen the trailers and stuff.

Guy 3: I've heard of it too!! In fact, I pre-ordered it already!
by Cosmic Twist August 10, 2009
Get the Halo 3: ODST mug.