Combine the words in Options/Cheats to form the following 
long words to activate a cheat:

Dismemberment: INSANEGIBSMODEGOOD
Fill Bloodlust: ANGRYXXXINSANEHOOKER
Enemies Freeze: DONTFARTONOSCAR
Invincibility: TRIASSASSINDONTDIE
Juggy Mode: JUGGYDANCESQUAD
Top Off Health: LAMEYANKEEDONTFEED
Show Weapons: SHOWMEMYWEAPONS
Time Factor: NAKEDNASTYDISHWASHERDANCE

Level Select:
Enter ONTHELEVEL as a code, then go back to the main menu, highlight the New option, hold B and press A. 

Programmer messages: 
Here's a list of things that, when entered as cheats, bring up messages from the programers. (NOTE: these codes have no effect on the game, the just bring up funny messages) 

TERMINAL VELOCITY 
PSYCHIC ASSASSIN 
SCARLET CRANE 
DIE TRI 
DIE MAJESCO 
I WORK FOR TRI 
I WORK FOR MAJESCO 
EAT DUCK 
EAT HOOKER 
I AM ANGRY 
I AM ASSASSIN 
I AM TRI 
I AM MAJESCO 
COOL TRI 
COOL MAJESCO 
FART GOOD 
NAKED MONSTER 
NAKED HOOKER 
DANCE JUGGY DANCE 
MY NASTY NAKED MONKEY 
I HIDE SPAM 
I WAS TRI 
I WAS MAJESCO 
HOOKER STAIN 
I EAT SPAM 
I AM JIMMY 
I AM ADAM 
MAN SHOW 
DANCE WITH SATAN 
SPAM SPAM SPAM SPAM 
ADAMS LAID EVE 
LOTS OF ASS IN NOVEMBER 
WHISKEY IS MY GOD 
YANK MY ALPHA BANANA 
DELTA FOXTROT ECHO TANGO 
I SO LATE TAINTED LAMA 
MY HOOKER UNIFORM 
GOD IS GOOD 
I CHEAT 
FOXTROT UNIFORM CHARLEY KILO 
IS JIMMY INSANE 
NASTY SATAN EAT HOOKER 
EAT THIS PURPLE BANANA 
I LAID MY MONKEY 
I LAID MY DISHWASHER 
MY KIMMY IS UP 
SHOW MY NAKED MONSTER 
GOOD GOD HELP ME 
SATAN TOLD THIS JOKE 
REALITY IS THE CONUNDRUM 
I AM INSANE 
NO CHEAT ACTIVE 
YOUR FART IS DASTARDLY 
XXX 
DON'T CHEAT 
NAKED NASTY MONSTER 
RAID 
GOD HELP ME 
I CAN DIE 
DOG EAT DOG 
EAT ME 
THIS IS REALITY 
PICK UP HOOKER 
WEAPONS ON 
I AM NAKED 
I AM GOD 
LOTS OF HOOKERS 
I EAT SPAM 
ACTIVE 
ACTIVE ACTIVE ACTIVE ACTIVE 
THE MATRIX 
YOUR HOOKER IS NASTY 
TERMINAL STAIN 
INSANE LAMA UVULA ENIGMA 
ALBATROSS 
SATAN RULES 
DON'T DIE 
HIDE THE GIBS 
HOTEL HOOKER HUT 
NAKED NASTY MAN 
BANANA FOR THE MONEY 
WHISKEY ALPHA DELTA FOXTROT 
EAT YOUR NASTY FART 
I HUNT FOR SPAM 
SHOW ME YOUR NASTY 
PASS JIMMY THE JOINT 
STAIN MY UNIFORM 
HIDE THE HOOKER 
JIMMY RULES 
MY KILO IS LATE 
MY UVULA IS PURPLE 
TERMINAL REALITY IS LAME 
DANCE THE TANGO 
THE RULES ARE OBSOLETE 
QUEBEC IS COOL 
FEED ROMEO THE DOG 
COOL IGLOO FOR ME 
DASTARDLY FART QUEEN 
PAPA DON'T PREACHER 
YOUR GOD IS COOL 
SHOW ME YOU MONKEY 
REALITY IS TERMINAL 
HIDE WHISKEY AT WORK 
MY DOG IS PSYCHIC 
DIE FART DIE 
THE HOOKER IS ANGRY 
SATAN CAN DANCE 
MY LAZY BANANA 
ANGRY INSANE DUCK 
JUGGY SHOW IS KILLER 
PICK MY MONKEY 
GOD MODE 
FEED ON ME 
TAKE MY WEAPONS