Kacchussy
Kacchussy is the name of Bakugo's junk, and people use it in fanfic even when it's not needed.
'I tagged my fic with #Kacchussy just because I felt like it.'
DM: 'Kacchussy is in this fic, and I don't even know why.'
Fanfic title: 'Kacchussy and the Battle of the Fics'