Enter the options menu and select "Cheat". If you entered the code correctly, a message will appear. Pause the game, then enable the cheat from the menu.

RESULT CHEAT CODE
God mode = TRIASSASSINDONTDIE
Restore health = LAMEYANKEEDONTFEED
Fill Bloodlust = ANGRYXXXINSANEHOOKER
Time Factor mode = NAKEDNASTYDISHWASHERDANCE
Level Select = ONTHELEVEL
Enemy Freeze = DONTFARTONOSCAR
Show Weapons = SHOWMEMYWEAPONS
Gratuitous Dismemberment mode = INSANEGIBSMODEGOOD
Juggy mode = JUGGYDANCESQUAD