BDYJTB comes from the YT (Youtube) channel @KingSoda. It means "Bitch Did You Just Talk Back". Naoya Zenin in KingSoda's skits says that, in a slightly loud tone. He uses it when Maki's mom or any sort of woman he is commanding or just being rude to in general, when they 'talk back', making him release a barrage of attacks on the specific woman he is being sexist and misogynistic towards.
Cheeseburger gets given to Naoya, this cheeseburger made by Maki's mother.
Naoya: Took you long enough. *bites then spits out burger* Why is there cheese in my burger
Maki's mother: Sir, you asked for chee-
Naoya: BDYJTB
"BITCH DID YOU JUST TALK BACK" Is a phase originaly made by the Youtuber KingSoda. This was created as a dub for naoya where he slaps Mai for talking back.
Naoya: Look at her walking around as a woman... disgusting.