9 is a slang for 9mm handgun. If someone says they are gonna put a 9 in you, it means they are gonna shoot you.
1: What's up dickheads? Ugly fat idiots!

2: if you don't shut your fucking mouth I'll put a 9 in you!
by Purpose Inc. January 3, 2017
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A silent place of study and responsibility
a: Wanna go out drinking tonight?
b: Nah man I live in Kopstraat 9
by NotYourStandard February 12, 2017
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