Press T during game play and enter:
Code              Effect 
/goodies     Weapons Upgraded 
/i win       Win Current Mission 
/big ass     Exits Game 
/onass       Throws Player Backwards 
/ouch        Hurts Player 
/wilcox      Makes Player Shake 
/3prong      Toggles Shadows On/Off 
/mission     Go to Mission (name) (below) 
/weezie      Enemies Ignore You