Top Definition
1. The shape of an om nom nom (looks very much like Pac Man)
2. Pentagon, hexagon, and omnomnomagon are three very well known shapes.
de Yuno Me 21 mars 2010
1 more definition
Pentagon has five sides
Hexagon has six sides
Octagon has eight sides
Omnomnomagon... is the shape of Cookie Monster
Cookie Monster is no longer just an amorphous blob. His shape will hence forth be known as an omnomnomagon.
de johnny5ive 14 septembre 2011

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