Chaz is the presumed love interest of David (Mr. Shank). After killing Mr. Shank and helping Athena escape, Chaz will ambush characters on their way out of the prison.
The strategy for fighting Chaz is consistent with other human bosses. Aim for his head, use fire and corrosive to whittle down his health, and use cover where possible. He can be a dangerous opponent, as he wields the Bone Shredder, which is capable of churning out hundreds of bullets in only a few seconds.
Unlike most prisoners, Chaz has a shield, which will need to fall before Incendiary attacks become effective.
Prisoners will spawn to assist him indefinitely until he is killed.
Chaz is an optional boss fight, as restarting the game will return characters to T-Bone Junction to meet Athena, without having to run back through the prison.
Mr. Shank tries to hide his relationship with Chaz. During one of the Engorge commercials, he refers to Chaz as "Chazmina", in an obvious attempt to hide the fact that he is dating a man. He also starts to say "his" before correcting himself and saying "her name", as well as "I'm not into him!" despite all evidence to the contrary.
Moxxi occasionally refers to Mr. Shank as David. "Chas and Dave" are a cockney pub rock group famous in Britain.