when a female begins to desire to have a child, or when a female develops motherly instincts, etc.
My friend won't stop talking about how sweet and cute babies are and how she wants to have one now - her biological clock totally went off!!

My friend says she doesn't want children...I guess her biological clock hasn't gone off yet.
by therealdef124 January 27, 2010
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A term used to describe the act of creating an obnoxious and hypnotising smell in the toilet ( or other ) area. Thus preventing entry to any other person for fear of involuntary convulsions.
George has laid seige to the toilet using biological warfare.
by Nig451964 October 30, 2008
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A biological meltdown occurs when a female normally between the ages of 28 and 34, who is without child, is placed into a chemically enhanced hormonal stupor that triggers a countdown in the synapses of the brain causing her to panic because she feels that her ovaries are drying up. Such a condition causes an unrestrainable urge in the female to engage in a loathsome marriage, already bound for divorce, with the first unsuspecting male companion lying prey to her mental instabilities. There is only one goal of such marriage, that is to lure the unsuspecting male victim into immediate and irrational procreation of a love child in order to satisfy the maternal needs of her biological clock.
As soon as the trainwreck hit 30, she had a complete and utter biological meltdown; she met Pablo online, married him on a casino cruise two weeks later, and now she is knocked up with triplets. The trainwreck couldn't be happier. Poor Pablo however; fled to Mexico after he realized he had become another unsuspecting victim to a biological meltdown.
by Maddog and J-Rod May 07, 2012
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A common excuse that women may use to guilt their significant other into marriage. More effective in a strong New Jersey accent, as portrayed by Marisa Tomei. This phrase originates from the 1992 comedy "My Cousin Vinny".
boyfriend: What's wrong?
girlfriend: The bills are late, we're out of Special K, 'My So-Called Life' was just canceled, and my biological clock is TICKING like THIS!
by Vamptastic May 04, 2009
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What assholes say because they can't understand the difference between sex and gender.
If you mean biological gender, then yes there are only two genders.
by DrStreetmentioner November 07, 2017
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a parent who has conceived (biological mother) or sired (biological father) rather than adopted a child and whose genes are therefore transmitted to the child.
Is the skid king your biological father?
by Gibnai October 21, 2013
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