What is Brown Bishop?
1.
To shake someone's hand after you've had your finger poke through toilet paper. Not usually done for real, just spoken to disgust your victim.
Dude, smell your hand. I just gave you a brown bishop.
See
2.
When you wipe your ass and a finger pokes through the paper. From the cassock worn by bishops
Damn, I really gotta wash, I got a brown bishop.
See