Top Definition
(n)A major world religion, committed to by all posers. Major god is Sean Maguire, aka:THE POSER, major customs include:1.poser rapping (praying) daily 2.always know that if not a poser Seans wrath will be upon you 3.ALWAYS without exeption say," Yo yo yo homie G."
Poserism was founded in 2005 AD by Sean Maguire.
by WTF April 25, 2005

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