I thought we collectively decided to stop saying "retard." That means that any mixture of -tard should be included in that. For example, if you call someone a libtard, (liberal retard), you're still practically saying "retard." Now you've got me saying it just to prove a point. We all become the monsters that we seek to vanquish. If that quote doesn't work for you, let me give you the famous Dark Knight quote, "you either die the hero or live long enough to become the villain."
Screwing this up means that this person has no concept of why this product is called what it's called. The point is that it's a tart, a pastry. It's a tart that you pop in a toaster. I don't know what a tard is, but it's definitely not a tard that you pop.