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Orgasm, plain and simple.

Because the intense feeling of cumming can feel like dieing a little - 'Petit Mort' = 'Little Death'
Yeah can't think of an example using petit mort. You really wouldn't use it in a non-french sentence anyway. don't bug me
by Lloyd Happy September 22, 2007
A period of post-orgasmic unconsciousness or deep sleep
Awakening from a petit mort, he heard his lover's voice in the next room
by Len July 05, 2003
A small death.
As he injected he felt the familiar petit mort of the drug in his system.
by Hector July 16, 2003