What is Boo!?
1.
Boo! is:
- To scare people very much.
And exist 
- Scare people, but not veryyyy scary.
- Girlfriend or boyfriend.
Justin: Sam, where are you?
*Sam comes and Justin don't sees her*
Sam: Boo!
Justin: Holy sh*t!
---
Justin: Sam, wanna be my boo?
Sam: No f*ckin' way!
See 
Random Words:
1. 
telling a group of people you want to call it a night - then after you convince the group leave the baryou circle the block and go right..