To become so enraged as to declare an unending blood fued between two groups of people, be they family, friend or socially related.
An unending rage that may only be satisfied by the extermination of the offenders friends, family and history.
The Hatfields and Mcoys were Banjo Mad for generations.
The killer was so Banjo Mad that he raped and tortured the whole family, even the dog, before he killed them all.
In his Banjo Madness he blew up his enemies family reunion.