Appears to be western Irish slang for 400ml of vodka. May have been used in old Russia where the term got picked up.
An average shot taken straight.
Ben: I had a nagan of vodka last night
Jerry: Bet that warmed you up
by nat2000 September 05, 2006
A group of people who cause trouble. These kind of people are typically found in the ghetto and poor white neighborhoods.
Those damn nagans stole my car again.
by davelk August 04, 2006

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