Jamie Foxx and Tyler Perry are being sued for $1 million each by a prisoner -- who claims the duo jacked his idea for a groan-worthy new comedy ... starring Foxx, Perry, and Martin Lawrence ... all dressed as women.

In case you haven't heard ... the project is called "Skank Robbers" -- a wacky action comedy about two lady bank robbers ... with Lawrence's Sheneneh character from "Martin," Foxx's Wanda from "In Living Color," and according to reports ... Tyler Perry's Madea ... from every bad movie you've seen. The project is reportedly in development.