The patch of hair seperate from the rest of the hair on the head of a man in the middle of male pattern baldness. Like a follicular version of the Oxbow lake. Named after Newcastle and England striker Alan Shearer, this term was popularised by radio DJ's Mark and Lard in the late nineties.

Other people sporting the Alan Shearer Island include Jim Robinson from Neighbours and Steve McDonald from Coronation Street.
"If I start loosing my hair I'll just shave it all off. I don't want an Alan Shearer Island"
by Big Jock August 20, 2007
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