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Something or someone that is so useless they serve no purpose. For example tits on a nun serve no purpose, they don't have sex so they are useless a sex objects, they don't have babies so they are useless to produce milk for feeding.
Mike is soo lazy he never helps out with any work. Yeah he's as useless as tits on a nun.
by nicks75 January 29, 2015
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Nuns take a vow of chastity so tits on a nun are useless because you can't feel them.
He is as useless as tits on a nun.
by answerme1211 June 12, 2012
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