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.