What is Boosch?
1.
An exclamation of disgust or disapproval.
"Hey, you want a bite of my peanut-butter and kielbasa sandwich?"
"BOOSCH! That's nasty!"
Or
"Yo... Condoleeza Rice is totally HOT"
"BOOSCH, dude! You need a new prescription!"
See 
2.
1.Saying something rude to someone like bitch, idiot, dumbass, the list goes on.
2.An insult.
1.Don't be a boosch!
2.Don't hit me stupid boosch !
See 
Random Words:
1. 
The phrase used to justify hooking up with an ugly or sub-par chick.
Jack- Yo dude I finally got with that Katie chick!
Nick- Nice bro..