@AsaAsika@davido So, in short:
Started calling himself โThe Baddestโ: around 2014.
Made it a major personal brand (โOBO Baddestโ): 2015 onward.
@AsaAsika@davido The nickname became even more prominent in 2015, when he announced his then-upcoming album Baddest (which was later shelved) and launched merchandise branded โOBO Baddest.โ