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a girl who is over obsessed with hart styles and one direction that it’s not healthy.
see that girl over there wearing the 1D shirt?

she’s a total osi!!
by harrystyles321098 June 03, 2020
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15
Office of Special Investigations.
It's a form of federal investigators for the Air Force. The equivalents are CID for the army and NCIS for the Navy.
Osi special agents asked me questions about my commander yesterday.
by Charlyes December 17, 2017
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