Going by the above definition; The rectal mucus made to accomidate bowel movements. Not enough to sustain fucking, which is why lubricants must be used. As opposed to the vagina which has natural lubrication, because it was made for fucking.
"I have to go on, but these ignorant democrat cunts write the stupidest fucking definitions. The only ass juice is the diariah your mom drank."
"The butthole was made for shitting, the pussy was made for hitting."
and the "shit packer" reference in Shitskin