Meek Mill has a song about Colin Kaepernick in the works -- saying the way the QB's been treated by the NFL is essentially a financial "lynching."
One of the lyrics -- "They won’t lynch him by hanging from a tree. They lynch his bank account."
Meek gave a preview of the song to Page Six ... saying the song will appear on his upcoming album. Other lines include ...
-- "They told Kaep to stand up if you want to play for a team, and most of his teammates said the same thing.