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Basically, thumb biting, which involves biting and then flicking one's thumb from behind the upper teeth, is a Shakespearean version of flipping someone the bird and saying "nanny nanny boo boo." It's an insulting gesture that sounds just a wee bit (okay, a lot) immature.
biting your thumb is a form of putting up a middle finger in the past
by Cilena May 28, 2018
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