- To scare people very much.
And exist Boo to, that means:
- Scare people, but not veryyyy scary.
- Girlfriend or boyfriend.
*Sam comes and Justin don't sees her*
Justin: Holy sh*t!
Justin: Sam, wanna be my boo?
Sam: No f*ckin' way!
That guy never said boo to you until you lost all that weight.
"Hey boo, what you doin' tonight?
Spending time with me, not your boys?"