I'm high as a skyscraper

from J.R. Writer (Ft. Cassidy) – GOAT Lyrics on Rap Genius

Meaning

A skyscraper is a very tall building, hence why it’s called a sky scraper.

Anyway, this is a simile. Cassidy is comparing him being very high off drugs (most likely weed) to how tall and high skyscrapers are in the sky.

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