Hi Diz,
I'm back after googling dictionaries. The Merriam-Webster online dictionary says that the word pro (nad the prefix) comes from the Latin word meaning "for." So the word pro means in favor of or "in the affirmative," so it does not mean "after," as far as I can tell. A pro-op would then mean a person who is in favor of having an operation. I guess you could say someone who got his d*ck cut off was definitely in favor of having an operation, therefore he was pro-op, but it's a bit of a stretch!
JayBee
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