Know the haters still jelly but fuck it though, it's the jam...

from Joey BADA$$ – Intro Lyrics on Rap Genius

Meaning

His haters are jealous but that’s just the way things go. Plays on the words jelly which could mean jealous and jam which could be a song.

To help improve the meaning of these lyrics, visit “Intro” by Joey BADA$$ Lyrics and leave a comment on the lyrics box