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1.
A girl who makes herself available to the men around her, allowing them to think she will perform certain sexual favours, whilst not in fact ever performing such favours. Hence useless boob. The boob is there, but useless as she will not allow anyone to make "use" of it.
God leala, you're such a useless boob. Let's make out....
by Sir William Arsenpuffin April 20, 2003