The meaning of the Acronym USSR is...

USSR is

• Union of Soviet Socialist Republics

More Meanings For USSR:

• Uninterrupted Sustained Silent Reading
• Union of Stupid Shit Russkies
• Union of Stupid Spasticated Retards
• Unsavory Soviet Stupid Rats
• Under Sorrowful Supervision Relationship
• The Underground Society Of Secret Rythm
• Uninterrupted Silent Sustained Reading
• United Stitching And Sewing Ring
• Union of Socialist Soviet Republics
• Union of Soviet Socialist Republics
• Union of Soviet Socialist Republics
• Uninterrupted Sustained Silent Reading
• United States Smoking Repression
• Ultra Simple Skirmish Rules
• Union of Soviet Socialist Republics

USSR is also in:

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• US Government