You often keep your ceral in them they are made of cardboard and some kids make robots out of them they are often a insult boys use on girls to show they are flat chested
Dude1:omg she’s pretty flat. Dude2:ye she’s a right cereal box
by Sexybaby6666 August 3, 2018
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Noun: Night Cereal is when you pour a bowl between 1:00am—3:00am and it becomes the most delicious thing you've ever been graced with due to lack of sleep.

True Night Cereal is used with frosted mini wheat.
I couldn't fall asleep so I read Flowers for Algernon with a bowl of night cereal.
by Gluten-free since 93 March 1, 2023
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Similar to happy hour, but with cereal. When the local grocery and drug stores are having sales on cereal, and you just buy as much boxes as you want to eat as much as you want in one hour. Good for when you are just bored and hungry.
OHH RiteAid is having a sale on Honey Bunches of Oats. I'm going on fucking cereal hour!
by gulsk329 July 5, 2010
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Man I’m so high... wanna make Doritos cereal? Sure thing man... (pours in Doritos inside bowl) (begins to pour Mountain Dew in the bowl) Ugh! MAN what the fuck?! (Begins to eat it) (swallows a bit of the cereal) (begins to throw up uncontrollably) MAN WHAT THE FUCK ARE YOU DOING?! (Continues to throw up) YOU OKAY?! (Throws up 5% of their brain) AAAAH!!!! WHAT THE FUCK?!
I’m so hungry for some Doritos cereal
by ieatantsforbreakfast November 7, 2021
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Every year, May 13 is a happy day for people who put milk in a bowl first and then cereal. On this day U CAN NOT get mad because of that because we celebrate National put milk in a bowl before u put the cereal day.
Anna: *puts milk in a bowl before cereal"
Mom: WHAT THE- R U DOING?
Anna: Chill, it is National put milk in a bowl before you put the cereal day.

Mom: I-
by Dahoodgrill123 November 4, 2021
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The look on someone’s face when they are pretending to like something. Everyone in cereal commercials pretends to enjoy it even though no one really likes cereal that much.
Would you look at her, she has stupid, cereal face.
by Zack the Angry January 18, 2021
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