A person with either a large nose, a bowl cut, or the ability to play the clarinet. Descendant of both the squidward and the shanth
Max looked towards the boy, and said

"God, that kid is SUCH a Seibert!"
by sluurp October 25, 2009
A person with negative qualities. Such as: Spoiled, Careless, Inorant, Rude.
"You should really control your child, she's starting to act like a Seibert!"
by Bonquisha Charisse August 18, 2011
Same as the Altoid Seibert, but without the Altoids.
The Altoid Seibert's cool tingle was a wonderful sensation. The Seibert was also nice but lacked the added coolness that makes the Altoid Seibert so special.
by BiggieUSC August 12, 2006

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