Debating whether Einstein's theory is a fallacy cuz I run on e but these MC's still square to me

from Telly – Glory Lyrics on Rap Genius

Meaning

Even when I’m exhausted (on E) I still rap and make music that’s better than a lot of people. These rappers (or MCs) are wack (square). This is also a play on Einstein’s theory of
Relativity.

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