1. bostin - Adjective
2. bostin - Interjection
(West Midlands) great, excellent
Ar, that's bostin, ar kid!
(West Midlands) bursting
I shouldn’t have drunk so much, I’m bostin for the loo!
bostin
(West Midlands) great!
Fifth Edition 2007 Update ed. Bostin: Bedford St. Martins, 2007. 606. e.g. films, soundtracks or video games. Source: Internet