maccamaniac
A maccamaniac is someone who thinks Paul McCartney is the best thing since sliced bread and would punch you if you said anything bad about him. They know all his songs and might break down if you mention any other band.
‘He’s perfect. I’ve seen him in my dreams. I believe it.’
‘I know every song he ever made. I’ve studied it.’
‘If you say Ringo is better, I will scream at you.’