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1.
A Pen used to mark or 'daub' scores in bingo (Mecca Bingo)
symbolises the change from excitement to safety or boredom.

Used in the Arctic Monkeys Song 'Fluorescent Adolescent'

'Mecca Dauber or a betting pencil'
by Lucas Kerr April 01, 2008
 
2.
In the context of the Arctic Monkey's song, Mecca Dauber refers to a large male organ - the Betting Pencil to a small one.
Was it a Mecca dauber or a betting pencil?
by Booshete' November 18, 2010