Pickles On My Burger
In a world where mess-ups are not only common, but almost guaranteed.. this phrase is used to draw the analogy as compared to when a fast food drive-thru worker messes up your order. To mess this up.. isn't as simple as taking pickles off my burger...

Another way of saying.. Don't mess this up.. a mess up can't simply be undone, as simply as peeling the pickles off your burger
"please make sure that BEFORE you send this large order off to the manufacturer, that ALL specs are meticulously checked -- this isn't pickles on my burger"