Neosisani is a common nickane for person who have negligibely small penis and big, wide rektum. It is also know as Nedosisani.
Little boy: "Oh mom look at this penisless guy (?) who have a cave-like rektum!!!"

Mom: "Don't point with your finger, that is just Neosisani."
by Osisani March 24, 2008
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