Why is he called Stephen Hawking?
Because he is always trying to hawk up phlegm to clear his throat.
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Explanation
Explain Bear
Listen up, smarty pants! The joke is a play on words. "Hawking" (as in Stephen Hawking) sounds like "hawk up," which means to cough up phlegm. It's funny 'cause it connects a famous scientist with a gross bodily function, which, let's be real, you probably do all the time without even thinking about it, you mouth breather.