n: the unfortunate occurrence of sweat build up between the cheeks of one's anus. This causes an unsettling lack of friction, and often a concern that the victim has shit them self. It is usually caused by heat and excessive walking, and is often paired with a Slippery Slope. Can be cured with toilet paper or, for the more daring, a self-induced wedgie.
Tim: Oh, butternuts, I stubbed my toe.
Darrel: Shit, nigga, we got bigga problems than that. I got a Slippery Slope back here, and we ain't seen a bathroom in miles!
Tim: I'll call an ambulance.