Big shot is an OST from the rpg game called deltarune made by tobyfox you will meet him some where in chapter two when you are with queen and noelle and you have to keep answering his question's correctly when you hit the uhmm dunno what button but you'll be introduced to it and keep anwsering until he says meet him at the trash zone for that you'll have to walk bacwards and go straight beacause his shop is behind you all you have to do is walk straight then go up the hill and you'll be at his shop then collect the keygen if you are going through pasticist, then do all three tasks for the hacker to help you go to queens basement, you have to surrive from the blob thingys and stay alive then put in the kegen in the broken down robot then you'll get a neo spamton fight to do just do pasifisict or Genocide if you'd want. (Sorry for the spoilers if you hadn't played deltarune)
(Summerizing all of that hurt my hands :( )