"Tu peux te brosser" or "tu peux toujours rêver" means you can keep dreaming or in your wildest dream. It's a useful expression when you try to tell someone to be more realistic or to give up on what they want to do.
The example in the episode:
"Puis-je emprunter ton ordinateur pour finir mon devoir?""Umm.. Tu peux te brosser, mais non!"
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