Powdered donuts is a joke from a Fanfiction on ao3 (Powdered Sugar by purplezipper) using the slashship RanPoe. 5 powdered donuts were stacked onto Poe’s dick and Ranpo ate them off.
Person 1: Bro, my mom bought me five powdered donuts today 💀
Person 2: kys what.
This is a Bungo Stray Dogs fanfic reference. It's a Ranpo x Poe fanfiction on AO3 (Archive Of Our Own), and is considered to be filled with smut, as it's a fic where Ranpo eats five powdered donuts off of Poe.
It has terrorized many comment sections and many BSD fans.