I have a feeling that it's a Liverpudlian nickname. He's probably had it all his life. I've certainly never heard a Scotsman, for instance, called Macca.
Nah its used up here also just easier than shouting someones full second name.
frank mcavennie gets called macca.
infact ive heard a good few people say you going to macca's being mcdonalds
anyways back on subject, dance tonight is a really awful tune and the only redeeming thing about it for me is that its only 3 mins long
i love most of maccas output and i would say it is one of his worst.