Edit
Exactly what it says on the tin. If expelled by a yukkuri it's usually close to expiring filling from the given type.
Yukkuris dislike the smell and taste of yukkuri shit despite being made of filling and thus taste decently sweet.
As a yukkuri's pastes also functions as it's brain, in some works a yukkuri can expel their own memories as shit (literally shitting out their brains). This is a defensive mechanism that is used to prevent the yukkuri from undergoing anti-yukkuritis by getting rid of uneasy and traumatic memories (such as the death of a family member). The process is automatic and though smarter yukkuri seems to be aware of this ability, most yukkuri shit out their memories without realizing it.
This however also means yukkuris have a hard time learning from their or other yukkuri's mistakes as those unpleasant memories would be shitted out (e.g. a yukkuri saw her sister dying because she did something stupid, shits out that memory and then proceeds to do the exact same stupid thing and dying).
In rare cases, a yukkuri who is aware of this memory expelling shit would try to hold their shit in to prevent losing important memories.
The following tags are aliased to this tag: poo, poop, and poo_poo (learn more).
The following tags implicate this tag: shitting (learn more).