1 definition by MacTheKinife

The age at which single women without children realise that their biological clock is ticking, As a consequence they may lower their standards and increase their willingness to perform sexual acts as a matter of desperation in order to find a mate/sexual partner. They may also attempt to hook up with younger males as an attempt to elongate their youth.

The expression almost always refers to women, as men are thought to always be in this state.
"Lets go to club x and pull some dirty thirties..."
by MacTheKinife February 24, 2010
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