A: It's a state of mind, man. When you're so caught up in your own rectal thoughts that you forget what's going on around you.
A: No, it's just a fancy way of saying you're really into your own rear end.
A: We're still researching that, but in the meantime, try staring at a mirror, then at a wall, then back at the mirror, then back at the wall. Repeat as necessary. It's not a cure, but it'll give you a good laugh.
A: Ha! Doctors can only do so much for you, friend. You might need to consult with a specialist in Rectaliciousness – the Rectal Whisperer. They're a real thing, we swear. Consultation services available here.