Meaning I´m serous. From SouthPark episode.
Always used in a humoristic way.
Nobody is gonna believe you didn't eat the cookies.
But i'm telling you it wasn't me. I'm cereal!
by Gastón Haro September 12, 2007
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Newbie, whightey, or old person trying to say "Fa`sh0w, I'm serious!"
n00b1: `/0 |)06 !/\/\ 50 1337
God: Really?
n00b1: For sure dawg, I'm cereal!
by osh September 25, 2004
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