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As you can see, both terms are basically slang – probably originated in the 1950s – for labyrinthine activities. Today they are used figuratively to convey the overall complexity of a given endeavor.
By injecting evident sarcastic tone into “It’s not rocket science” or “It’s not brain surgery,” the speaker is able to turn meaning around and communicate, “It should be as easy as pie* to even the most dimwitted dolt.”
Through a clever combination of the two boorish chestnuts into one purposefully retarded insult, “It’s not rocket-surgery,” the writer of the toilet paper query apparently felt she was able to dish double abuse toward her husband, as in, “Really, honey, can you TRY not to be such a lazy dumbass?”
In truth, she probably either accidentally crossed the metaphors or she stole the ironic expression from movie dialogue, where I do believe I've heard it before. I can respect that; my inspirational lexicon is crap-comedy as well.
Rocket-surgery. Eh—I like it. And so, it shall now be one of my own vocabulary bon-bons.
*While I'm at it... Wikipedia defines pie as a baked food with a baked shell usually made of pastry dough that covers or completely contains a filling of ... [blah blah blah].
For those of us who consider a kitchen to be an extension pod of some culinary version of purgatory, pie-baking rates right up there with rocket-surgery. Hence the expression "easy as pie" represents an oxymoron for a fair percentage of the populace.
Incidentally, who in blue hell has so much time on their hands that they sit around updating "pie" wikis which no one will ever read, except that one verbose self-serving blogger out there who needs editorial fodder? I wish I were so fortunate as to be able to waste my intelligence on a bunch of anonymous web trolls all night. Wink wink.
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