A term originating from the My Hero Academia/Boku no Hero Academia
fandom. BakuDeku is the ship name for Katsuki Bakugo and Izuku Midoriya. The
ship is very divisive among fans, with some being massive fans and others being massive haters. The order of the names indicates who the
top and who the
bottom is, with Katsuki being the
top and Izuku being the bottom in this case. However, within the actual series, all evidence points towards this
ship being the last possible outcome. With Katsuki physically abusing Izuku in the first
scene of the show/first panel of the manga, and telling him to kill himself in the exact same episode/chapter. While Izuku has never been confirmed to be straight or gay, the evidence points towards the conclusion that there's no world where Izuku would reciprocate feelings for Katsuki due to his abusive nature, even if he did get better later on in the series. Essentially, it's the yaoi version of Hetslop.
Person A: Hey
man, do you
ship Bakudeku?
Person B: What? No. Izuku wouldn't even like Bakugo like that...
Person A: You're crazy
man, they so obviously have crushes on each-other.