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1.
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
 
2.
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
 
3.
A small death.
As he injected he felt the familiar petit mort of the drug in his system.
by Hector July 16, 2003