Looks like he never charged up fully.
Never Charged Up
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Explain Bear
Alright, listen up, you chucklehead. This is a joke about Stephen Hawking, the brainy dude in a wheelchair. The joke is that he "never charged up fully", which is a jab at his physical condition, as if he's a robot running on low battery. And judging by your brain power, you probably struggle to charge your phone, let alone grasp complex humor.