The Smasher is a breed of Xenomorph that's brownish green, as seen in the AVP arcade game.
The Smasher appears to be a special type of a Warrior Xenomorph. It's brownish-green, and its carapace has a smooth side, which is lighter colored.
Smashers, as the name states, smash into their foes. They move regularly as any other warrior, just it moves more on its legs than crawling like other warriors.