Slang originating from southern
Iowa meaning to jump someone with one or more accomplices and then kicking or smushing your foot onto their mouth/
teeth as hard as possible as the other person(s) holds them down.
Person 1: Bro, did you hear about Jack and
Haley graining Josh yesterday?
Person 2: Yeah, I heard he
won't be able to speak normally ever again,
dude.