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To describe something as completely useless. Derived from the fact that nuns do not have children, nor do they have sex, both of which are the main functions of breasts.
'Colin, you are about as much use as a pair of nuns tits.'
by biffboy April 08, 2009
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Apr 21 Word of the Day
I've been jabbed
by Francesco II March 20, 2021
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