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1 definition by Mark the man aka MTM

 
1.
A lighthouse: area that allows light to pass between a woman's legs and her public area- this must be observed while she is standing up with her legs closed together. If a woman has a lighthouse, one would be able to see light coming through this natural space regardless of how close her legs are together. If she's too overweight if flabby the fat closes down the passage of light.
Even though Jane is overweight, she still has a lighthouse.
by Mark the man aka MTM March 12, 2011