This is one of several tributes to Mibzy (Mibsy) (King of paint) that can be found in Bristol. More about Mibzy here.
This ‘burner’ (straightforward lettering or word) is attributed to Bristol artist Deamze, although I am having difficulty confirming it. It has been slapped up on a derelict shop front. Looking at earlier photographs of this tribute on the Interweb, shows just how rapidly this building is crumbling. A forgotten side street, but Mibzy is not forgotten.