The terribly painful burning sensation one's anus has after eating extremely spicy and/or poorly prepared foods and trying to crap it out. It literally feels like Satan himself is poking his head out of your ass and ferociously licking your anal cavity. There are individuals who actually enjoy the burning feeling that comes after the SRJ.
Jack: Dude. I don't feel so good.
Dj: What's wrong, man?
Jack: I had some Taco Bell awhile ago. I think I feel an SRJ coming.
Dj: Oh shit. I'm sorry dude. Satan's rimjob's fucking suck.
Jack: Dude, I love SRJ's. It feel so good afterwards.
Dj: ...That's fucked up man.