The belief in the Family Guy character, Stewie's, beliefs in world domination. This belief comes with the urge to quote the character.
Stewieist: Damn you all!

Guy: Dude, you believe is stewieism?
by silly heart August 7, 2009
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A man who believes in the all-father Stewie. They are commonly reffered to as faggot or my bitch.
Guy: heil stewie
other guy: oh no he practices Stewieism
by erikkillmonger March 14, 2018
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