What Does The Word Mush Mean As Slang?

Mush means Man,lad the male in Romany...
IE Here you are lad!
"Here you are Mush"

This is what I was told..

A bunch of mushed up food or it could be an insult.

Mush in slang is to throw some one's head back with your hand. Kind of like if they got in your face and you took a hand to his head and threw it back. You'd say, he got up in my face so I mushed him.....