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9.
A person who takes an inappropriate amount of milk from the carton for his own satisfactory, leaving a very small ounce of milk inside the carton, not thinking of the others who live in the household.

By doing so, the next person who has a desire for cereal, pours the leftover milk into his cereal bowl, leaving an uneven bowl of milk and cereal.

It is basically the person, or cereal killer, leaves a small amount of milk, and someone else attempts to eat cereal, but is instead left with little milk and a lot of cereal, blaming the suspect.
Steve: Hey, you alright? Did you eat any breakfast?

Jake: No, man, it was because of that cereal killer,

Craig.

Steve: Don't worry, dude, you're not alone. You're not the only person who lives with a cereal killer. I live with one, too.
by ProcrastinatingPanda June 14, 2011
 
1.
Who the hell would kill cereal? The sick bastards.
That bitch murdered my Fruit Loops! He gonna die!
by ILikeCereal July 01, 2003
 
2.
Synonym of Cereal Murderer.

Anyone who committed mutany towards Cap'n Crunch, snare-trapped the Trix Rabbit, killed the Lucky Charms Dwarf, and made chicken soup out of Cornelius the Rooster.

In addition, the one that infected the Alpha-Bits computer mascot with the installation of Windows XP and subsequently died of worms and viruses.
Danno's a cereal killer wanted by the FBI (Federal Bureau of Idiots).
by Damn Damn Danno October 07, 2005
 
3.
One who consumes a lot of cereal.
Divorce lawyer: Well, you're really screwed now. Looks like your wife is going to take everything, and you're going to be stuck with a lot of alimony payments. If I wasn't such a shitty lawyer, you would probably be ok...but I'm a shitty lawyer, so you're really screwed. After you pay my fees you might not have enough money to eat. Oh well, I'm a shitty lawyer and I really don't care about you, or anything else for that matter.
Ted Bundy: Huh. Didn't see that coming. Guess I'll become a cereal killer.
by mrm5593 September 27, 2006
 
4.
noun
a gamer who frags his/her opponents repeatedly in a intense and quick fashion, usually surviving an onslaught of multiple enemies at once.

origins: Derived from the word serialkiller, exchanging "serial" to "cereal" denotes that the player is "having his opponents for breakfast," a phrase which implies a harsh killing done on his/her enemies.
Thomas is a real cerealkiller, he played against the odds on a five versus one match and won!
by Sogeking August 16, 2007
 
5.
1.one who kills cereals

2.another name for Montana
1. Oh no! My Cocoa Pebbles are dead! Must've been a cereal killer!

2.Where do you live young man?
Why I live in Billings, cereal killer.
by fishrocker April 07, 2009
 
6.
Someone who loves cereal so much they don't even wait for it to come out of the box before they gobble it up and don't let anybody else have any.
You tell Johnny the next time he comes over here after school he better not act like no cereal killer.

This kitchen looks like it has been hit by a cereal killer.

Wipe you mouth an stop actin' like you wuz da top ramkin' cereal killer.
by Pat Eberhart June 14, 2006
 
7.
Someone who is on a diet and only eats cereal
My cholesterol was so high, I was forced to become a Cereal Killer
by itzritz April 07, 2009