And I refused to burn money, I’m saving green in my room
You walk in and think it was FernGully

from XV – Pictures On My Wall Lyrics on Rap Genius

Meaning

XV wouldn’t spend [burn] money. He saved so much money in his room that you would think it’s FernGully. FernGully was a movie about the last rainforest. There’s a lot of green in a rain forest.

Fern Gully also refers to an area in Jamaica with an immensely high population of ferns:

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