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1.
An incredibly large penis. Exceding all other penises by a large margin.
"Mam, Duffman's Osokin is way larger than DirtyJoses."
by Duffman November 18, 2004
 
2.
the fattest of all the cocks
"Man dirty Jose is packing an Osokin!"
by Dirty Jose November 18, 2004