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A maccamaniac is someone who thinks Paul McCartney is the best human ever and would fight you in the street if you said anything bad about him. They know every song he ever made and can tell you the exact day he wrote them. They might pass out if you mention a different band.
'I swear I’ve seen him in the grocery store. I almost cried.'
‘I know the lyrics to every song he ever made. Even the ones he forgot about.’
‘If you say Ringo is better than Paul, I will punch you.’