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a Birmingham Girling is a 'Mug Bet' a person placing a bet on something which has no chance of winning.
'I made a Birmingham Girling bet because I was drunk, I bet $50 on Tiger Woods winning gold in the Olympics freestyle swimming'

'I cant believe it, in the casino last night Ian bet his wages on roulette - he put all his money on blue? What a Birmingham Girling'
by GamblersRamblers December 30, 2013
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