Browser's Block is a temporary inability to begin a new keyword search on one of the popular web engines (Google, Yahoo, etc.) due to a sudden "blanking out" while staring at the screen. It's cause is unknown. AKA, "Google Block" or "Surfer's Block"
It's 2:12 AM, you are awake and seated at your computer. You want to look up something or learn something new, but your mind is so overwhelmed by the infinite keyword search possibilities that you are forced into a temporary paralysis called Browser's Block.