Geechi is slang meaning person of Gullah origin. The Gullahs are black people living in the Low Country, who have preserved their links to Africa arguably more than any other African-American group. In more modern days it is used by rapper Wale and other MMG artists to mean confident or having a lot of swag.
I got geechi on her, came back with thirty chains
Now she attentive, I bet she listen to everything = Wale