I’m trampolining on niggas and I actually mean it
A fly nigga, I keep having a gravity grievance

from Big Sean (Ft. Wale & Wiz Khalifa) – Life Should Go On Lyrics on Rap Genius

Meaning

He’s saying he uses haters and weak rappers to get to where he wants to be. In other words, he’s jumping or “trampolining” off of them & they propel him further up (like a trampoline).

Then in the next line he states that he’s so fly gravity is jealous because it can’t even bring him down.

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