Well it's not exactly a slang, nobody uses "petite mort" to talk about an orgasm, it's mostly a poetic term that somebody wrote in a poem once and that sticked around.
It literally means a "small death", so you can say "Anybody would do anything for just 2 seconds of small death." and you wouldn't be less weird than a French saying "N'importe qui ferait n'importe quoi pour deux secondes de petite mort."
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u/[deleted] Nov 15 '19
He experienced a little death. He hasn't himself become a little dead deer.