A sick asshole, take for example: this fucker down at the cafe who knocked over MY cereal! Can you believe that? I mean, really. Is it a good story? I've been doing this same shit all day.
Guy 1: Hey, du' this ho knocked ova' mu siri owl. I'm gonna' kiw dat' cereal killer
Guy 2: O' riley?
Guy 1: I know you, you're the one that did it, fucktard!
Guy 2 Is stabbed multiple times in the heart. Cops come.
Cop: This guy was black, fuck it. We'll just say he committed suicide.
by Rockcroc September 16, 2015
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1) Someone who kills others using breakfast cereal, or someone who goes to the store and kills cereal.

2) Someone who turns delicious Froot Loops and turns them into nasty cornflakes, or even putting juice rather than milk into another man's cereal and giving it to them.

3) Someone who eats cereal with juice instead of milk.
HE TOOK MY FROOT LOOPS AND SHOT THEM!! Now they have turned to CHEERIOS?? WHAT A Cereal Killer.
Ok, well Cheerios are ok. They are still good. I will still eat them.
NOT ANYMORE! HE BURNT THEM AND NOW THEY ARE Flaming Hot Cheetios!! GROSS!!
by XxxxRe1nZxxxX April 21, 2020
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yes he is he kills all the cereal around even capn crunch
hey you is konnor a cereal killer
by nomoresayingcusswordssss January 24, 2021
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A hired fellow-human exterminator --- often a harassassin --- who causes his marks' premature demise by forcing them to eat oatmeal or other grain-based comestible that they absolutely detest, and so said abused victim commits eventually suicide to escape said culinary coercion.
They called Ted Bundy a cereal killer, but I happen to really enjoy hot oatmeal, plain shredded wheat, and other "simple fare" breakfast foods, so Teddy's tactics would have been much less effective at getting me to bite da dust than they would have been with many other folks with more of a "sweet tooth" or "meat 'n' potatoes" meal-selection preference.
by QuacksO May 9, 2019
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One who eats all their friend's cereral at his/her friends house and eats all the cereral at at Walmart without waiting to pay for it.
Person 1: Would you like a snack?
Cereal Killer: do you have cereal?
Person 1: yes...
Cereal Killer: (runs away)
(Comes back with all the cereral his/her friends have and eats it in under 5 minutes)
by MircroToasterWave May 29, 2019
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Someone who who eats NOTHING BUT CEREAL every single day for breakfast and constantly buys cereal and even sometimes steals yours AND IT'S REAL GETTING REALLY FUCKING ANNOYING WHY DID YOU EAT MY CURIOUSLY CINNAMON JIMMY THAT SHIT'S EXPENSIVE AND YOU FUCKING KNOW IT
Employee #1: Damn, didn't that guy buy cereal like last week?
Employee #2: Yeah, but he's a cereal killer.

*Oh btw i don't actually know a guy called jimmy so it isn't an inside joke OKAY!?
by thegovermentislizards69 March 18, 2015
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