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2.
1) An inquisitive remark; a way of asking "are you for certain that what you are expressing right now is something that can be trusted?"
2) A confirmation of seriousness.
3) A deep and philosophical question, as in: "Are you sure that you are not dicking around right now?"
4) An exclamation.
1) Are you for cereal?
2) For cereal.
3) SUPER cereal?
4) Cereal!
by Blue Goose March 25, 2008
 
1.
A statement used that questions the validity of a statement. Similar to the phrase "are you for real?"
Ellen: Oh my goodness, today my father purchased a new ride for me! A 2005 Benz!

Janet: For cereal!?!?!
by Molly May 06, 2005
 
3.
The combination of SErious and for REAL.
JaJa: Xbox 360s went on a recall because Mexicans made it.
GenGen: Lolz... for cereal?
JaJa: yah
GenGen: pwned
by Rodolfo S.J. October 16, 2006
 
4.
A COOLER way of saying "FORREALZ?" Other forms of the expression is "Cereally?" and "OMGFORCEREAL?"
When you say it, you usually jump up and down and make flailing arm movements.
"I JUST WON THE LOTTERY!"
"OMGFORCEREAL?!?!"
"wow. you just ruined my win by saying that."

(teenage girl)"SO I WAS LIKE "FOR CEREAL?!" AND HE WAS LIKE "YEEEE-YUHHH!!" THEN I WAS LIKE "OHMAHGAH!!!"
by Cassizzle:D August 21, 2010
 
5.
honestly; seriously. Derives from and sounds like the phrase "for serious?" Variation on "for real?"
synonym: "fo sho"
Person 1: I heard so-and-so is getting fired.
Person 2: for real?
Person 1: for CEreal.
Person 2: wow...that's some harsh stuff.
by nipopo91 June 07, 2009
 
6.
A very stupid way of saying "for real".

People who find this annoying phrase funny, or worse, actually use it in conversation, whether real or online, are complete and total retards.

It should also be noted that there is a positive correlation between how much you use this phrase and just how big of a retard you really are.

Person 1: "Hey, my grandma is a leprechaun!"
Person 2: "For cereal?"
Person 1: "No, yours is you retard."
by Johnny Mark McGroom February 16, 2009
 
7.
1) An inquisitive remark; a way of asking "are you for certain that what you are expressing right now is something that can be trusted?"
2) A confirmation of seriousness.
3) A deep and philosophical question, as in: "Are you sure that you are not f*cking around right now?"
4) An exclamation.
1) Are you for cereal?
2) For cereal.
3) SUPER cereal?
4) Cereal!
by Blue Goose March 26, 2008