In case you are unaware, "poop knife" was a reddit r/confession post from a few years back that went viral, where someone admitted their family has a knife kept in the house specifically for when big 'movements' wouldn't flush, and he had just discovered that wasn't a normal thing everyone just has at home when he needed flush assistance at a friends house.

You ever drive down a rural road, and out the window you suddenly come across an old shuttered up house? The kind of house with five cars parked on the front lawn in various states of disrepair? With overgrown bushes pushing into the peeling paint of the wooden siding alongside a giant novelty bigfoot that seems to stare at you as you zip by down the road? The one with the chain link fence that's torn in five places and yellowed trailer up on blocks? The one with a dog tied to a post, barking it's head off outside, so you know someone actually lives there?

I imagine these threads are like a window into the lives of the people in those houses. It's like they're living in a whole different society, with their weird quirks and vaguely unsettling rituals.

It's a reference to an old reddit post. In the post, the OP explained they had a knife at their toilet for poop that got stuck, hence the poopknife. It was only later in life when they asked a friend for their "poop knife", when they discovered that nobody else has a knife like that and how weird it is.

I shall take that as a compliment

https://knowyourmeme.com/memes/poop-knife

I want to believe this is all /s but I haven’t gotten the feel of Lenny quite yet.