A leopard can't change it's spots)
But I'm a fucking unicorn (Whatever man)

from Tyler The Creator (Ft. Domo Genesis, Frank Ocean, Hodgy Beats & Mike G) – Window Lyrics on Rap Genius

Meaning

Tyler has referred to himself as a unicorn multiple times throughout the album. Within this line, Tyler refers back to these references and says he isn’t what people think, he’s something completely different/mystical/magical all together.

http://www.youtube.com/watch?v=bYIi-7hnwhA

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