9

Code for when an adult/parent/teacher whatever is listening, watching, etc.

Person one: "Yeah she said she was going to hook up with-"
Person two: "9"
Person one: "..."

9

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!

kopstraat 9

A silent place of study and responsibility

a: Wanna go out drinking tonight?
b: Nah man I live in Kopstraat 9