^Me too. I think he's saying, he's had the shits, and still has them, so he doesn't really want to go sit there and let his ass cavity full up with the shits, while getting a haircut. That's along time clench his asshole....some may slip out.
Thats what I got out of it anyway.
OH WAIT! I read it again. I think he's saying he doesn't want to shit himself while getting a haircut.