"Me say war", Luke Cage season 2, is this just "Movie language"?

The official language of Jamaica is English, but it's a fairly strong local dialect that's often used, and that's what is being demonstrated in the show.

From this link:

While English is the official language of Jamaica, the large majority of the Jamaica people speak a form of English Creole, known by linguists as Jamaican Creole or Patois. Jamaican Creole can best be described as an English-lexified Creole language; a mixture of English and a variety of West African languages.

As I recall, the Jamaicans in the movie Cool Runnings spoke in a similar fashion.

As an interesting side point, when watching this show in the UK on Netflix with the subtitles switched on, what you get delivered is "normal" English as opposed to the actual dialogue being spoken - the subtitles tell you what the character would have said if they were speaking without the patois.

It's "Mi say" not 'Me say' but yes, that's Jamaican patois - see How to Speak Jamaican Patois

To hear it for real, try Linton Kwesi Johnson's 'Forces of Victory' album There's a full track listing on the right of that page.
It's all spoken, he's a dub poet. [As a bonus, it's also one of the best reggae albums of all time ;)

"Me say war" is part of the lyrics of "War", that can be easily considered as one of the greatest songs (in terms of social and consciousness poetry) of Bob Marley. I'm also watching the serie and thought that it was a reference, and wondered to myself if somebody understood it that way; when i googled it (as "Bushmaster me say war"), you guys were the only who notice something and talk about it xd. Now i've got a doubt, i think it just could be on of these two: - Nobody get it that way (i think that is a quote, obviusly based on that Patois language you were talking) - Nobody watched the serie

Haha, greetings from La Plata, Argentina