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1.
Another way of saying "extremely serious", Serious=Cereal.
Originates from the recent "ManBearPig" episode of South Park.
"Guys! I'm super cereal right now! ManBearPig is a major threat!"- Al Gore
by TFE August 07, 2006
 
2.
Another way of saying that you are really serious. Can be translated into "super serious". Originated from the South Park episode with ManBearPig.
Guys! I'm super cereal right now!

Guy 1: Did you hear the dude got shot? I'm super cereal!
by DucNukem January 15, 2008
 
3.
Is a term that is commonly associated with being "extremely serious" or "super serious".
Also can be correlated with being inebriated. (see example)
"He's had some drinks." "Are you serious?" the inebriated: "I'm super cereal!"
by Cycron February 09, 2009
 
4.
A really, really cool, strong, or evil bowl of honey-bunches-of-oats. It usually has at least one superpower and generally has a cape. Yair can be considered a supercereal.
"It's a bird, its a plane, no, it's one of those supercereals!!!!"

Katsof is definitely not a supercereal.

My dog was stuck in a cave full of spoons when suddenly, a supercereal saved it.
by evilp0ptart March 13, 2009
 
5.
you are so serious that you would bet a bowl of cereal with 1% milk
Often associated with manbearpig
Manbearpig is real. I'm super cereal.
by bjkal April 19, 2008