blastr' is a made up word used commonly in suburban Brisbane, Australia.
It is used for somebody who is so linguistically talented that they can spit bars and rap an entire verse with coherent lyrics over any beat.
An australian synonym for lippa.

n. The birth name of somebody who has changed their name. Most commonly attributed to trans people, but can be attributed to any person who has changed their name. (sometimes written as two words: dead name)

v. 1. To call somebody by their deadname.
v. 2. To out somebody's deadname to the public.