Shilly

A mixture of the remnants crusty fecal matter, ass hair, lint, and sweat that collects near the tailbone area. Often as a result of wearing underwear too long. Shilly is a highly hallucigenic substance due to its unorthodox makeup

Boys, I've been farming shilly from the football team. Let's get together and smoke a shilly pipe!

Dude, when you have a moment, let me get some shilly. I've showered so I'm fresh out