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1.
An abbreviation for the Oklahoma School of Science and Math, connotations also linked to torturious prison, meaningless life, and juvenile.
If OSSM is your life, im sorry.
by Zoheb April 19, 2005
 
2.
Old School Scary Movie(s)
O.S.S.M'S are way better then the scary movies that we have.
by The Corsair February 11, 2012