a rillo is the other side of the gooch.as the skin that joins from the anus to the back in between the cheeks.that sometimes looks red while chucking a browneye.

Slang for cigarillo - a small narrow cigar which typically has the tobacco emptied so it can be refilled with weed to make a blunt.

While rillo can mean the specific, blunt-like variety of tobacco product, the word is more frequently used to mean simply "cigarette". See Rill.