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1.
Someone with a massive pair of nipples, of a similar size to the Digestive.

The biggest advocate of the Biscuit Nip was Ange Morris, who's nipples were so round that lore says she had more areola than flesh.
"I popped round and she was topless sunbathing, you should have seen it, proper Biscuit Nips!'
by CheekyFridays November 01, 2011