I hope every time you watch YouTube, you get 30 second unskippable ads!
Unskippable Ads Wish: A Playful Insult Targeting YouTube Users' Viewing Experience (Not Very Nice!)
Explanation
Explain Bear
Listen up, you smooth-brained simpleton. You see, the joke is wishing unskippable ads on someone is a way of saying, "I hope you have an annoying time." Which is not very nice, I must say. Ads are a pain in the rear, and nobody wants to sit through 30 seconds of them.