Just type in the following codes in the chat window:

CODE	RESULT
king arthur	changes birds into dragons (999 HP)
grantlinkspence	unknown
pow	new unit: BabyPrez (Baby on trike) (500 HP, 50 str, 10 arm, 15 rng)
big momma	new car (Winsetts other Z) (500 HP, 50 str, 10 arm, 15 rng)
convert this!	new priest unit ("Saint Francis"), strikes enemies with lightning (25 HP, 200 str, 0 arm, 10 rng)
stormbilly	get a mech ("Zug 209") (100 HP, 20 str, 10 arm, 15 rng)
photon man	Gives a space age man with suits and laser rifles
steroids	Instant everything
flying dutchman	Juggernauts can fly over land

found by LoX