I pray my dick get big as the Eiffel Tower
So I can fuck the world for seventy-two hours

from Kendrick Lamar – Backseat Freestyle Lyrics on Rap Genius

Meaning

To get this line in the context of the song (and the album), this is Kendrick freestlying like he’s 16.

A statement concerning the misconceptions rappers/guys have about what it is to be a man: the size of your dick (ego, self-importance). In this immature time in his life he’s PRAYING for a huge dick. He sincerely wants to be a man, but all he really knows about man-hood is having a big dick.

Metaphorically, Kendrick praying for a huge dick, is him praying for that respect and thus endurance, to last. If the size of your dick garners respect (in this case in the industry), then a dick that lasts 72 hours is to an artist that is respected for decades.

Interesting fact:

the Eiffel Tower is 324.00 m (1,063 ft) tall, and the Earth is 7,926.41 miles (12,756.32 kilometers) in diameter, so his dick would be 0.000025% of the ‘length’ of the world.

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