This verse comes from the song 'Old town roads' and I've never heard it before, can't find a definition/explanation online either.
Thank you !
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Assuming Genus Lyrics' "Verified Artist" icon is correct, the actual author, Lil Nas X, has commentary on this line
ARTIST Lil Nas X 5,977 3 months ago This second verse is where I’m in this better lifestyle. I have me a brand new tractor. I’m on some Lean–not trying to endorse that, by the way. But I’m in a higher place now.
The drug Promethazine with Codeine is commonly known "on the street" as "syrup" and/or "lean," the latter due to the abusers’ propensity of having difficulty in standing up straight.