Top definition
Alien Swarm is a co-op squad-based shooter UT3 mod. Set in the distant future, the players take the role of a Commander in the Interstellar Armed Forces. They must guide their squad of marines through Swarm infested colonies, overrun bases and outposts, to achieve a variety of objectives.

Featuring Assault Rifles, Heat Tracking Guns, Sentry Guns, Flamethrowers and more. Alien Swarm can be played single-player or online co-operative multiplayer, with a strong emphasis on teamwork between the marines in both forms of play.

Alien Swarm is now on Steam, as a Source Mod.
guy: wanna play alien swarm??
guy2: the Steam version or UT version?
guy: what Steam version??
guy2: it just came out on Steam as a Source Mod
guy: well, like all urban dictionary definitions, i have to say something perverted now so-
guy2: ASS CLOWN!
guy: hey! i was gonna say that!
guy2: TITS!
by Hoffer July 17, 2010
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