During gameplay hold down the Control button 
and type the code:

vlammetjes - Kill Selected Unit
kipkorn - Get Uncongnuits
kaassoufle - Warp to Mouse Pointer
frietspeciaal - Control over Enemy units
frietjeoorlogmetuitjes - Control over the Cops
patatmet - Control of your units
broodjekroket - Get $450,000
frikandel - Get More Hooligans
frietjewaterfiets - Get 4 Hooligans of Every Kind (Hardcore/Special Units)
shaslick - Get Guns and Bombs
stamppot - Instant Win
boerenkoolmetworst - Instant Defeat
bereklauw - Heals Selected Units 
mexicanosate - Get Drugged
hamburger - unknown