Top Definition
Usually said by greasy men with rats tails and track pants. Number one gun indicates that the person being called said name either got some 'hawt' girl or has a 'sick' subaru his mum bought for him with their kebab shop profit
Heard Steve got with his 3rd cousin the other week, number one gun! keeping it in the family!
by Huntehhhhh1 April 24, 2008

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