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1.
1. A period of 25 years.
2. A 25th anniversary of a birth, wedding, sobriety, etc.

Derived from the atomic number for Manganese (Magnesium) off of the periodic table, and a British slang term for 25 pounds.
I lived in Boston a Magponium ago.

Her Magponium party is going to be crazy!
by Starbuns August 31, 2010