Burapa is Burhapa, it means old age. When he says, "Badtameezi ek bimaari hai. Aisi bimaari jo dhire dhire waqt ke saath burhape mein badal jaate hain. Main kehta houn, jab tak burhapa nahi aata, thodi badtameezi kar lete..." generally that means Being a badtameezi is a disease, such a disease that slowly with time in old age changes. I say, until the time old age comes, you can be a little badtameezi. Badtameezi can't very literally translated in a graceful 1:1 way, but generally I think of it as improper, rebellious, these kinds of things.