Look, Overly Sticky Sweet Dumplings Are Not Real Dumplings, You Idiot!

Gintama.: Slip Arc · Episode 11 · “Look, Overly Sticky Sweet Dumplings Are Not Real Dumplings, You Idiot!”

Consists of episodes animated from unused manga chapters, before returning to the Silver Soul Arc on January 8, 2018. Porori is an Onomatopoeia for something (mainly water) falling.