I showed y'all how to turn up
100 j's in my ashtray bitch I showed y'all how to burn up

from Machine Gun Kelly – Breaking News Lyrics on Rap Genius

Meaning

If you’re lucky enough to hang with Kells and the crew then he’ll show you how to turn up, and with 100 J’s he’ll smoke you out for sure.

Kells even has his own weed strain at the Hollyweed dispensary, called “MGK OG”.
https://twitter.com/machinegunkelly/status/237751239037829121

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