Effing Worms is an action platform game you can play online at addictinggames. Use arrow keys or WASD to move the giant worm around and start the omnomnom frenzy.
Short game description:
Don't you wish you were a giant worm? Dig fast tunnels, and surprise hippies, cops, cows and pedestrians from below! Feed the beast, baby!
Effing Worms walkthrough gameplay