To my faithful student, Twilight Sparkle,
Admittedly that is a euphemism I haven't actually heard of before. Speaking as somepony with a great many embarrassing or painful memories in her past, however, I feel I may offer you some advice.
In life, Twilight, there are times we wish we could do differently or do over. There's things we learn that make past actions seem terribly silly, or things we wish we did not know. That's okay, it happens to everypony. Just know that embarrassment and pain are temporary, and the growth you experience, the strengthening of your soul through these trials will stay with you always. The worst shall pass if you can let it, the best shall stay with you always. When it is our turn to go to the Summer Lands, we'll look back on the bad with the good and smile, knowing that we did our very best, and it is worth it for the wonderful times that we have had.
Your loving mentor,
Princess Celestia.