Due to the symmetry in mosfet, source and drain are interchangeable. So we define the source of nmos is the terminal with the lower voltage. So if we force Vds to become negative the drain and source should flip. So Vds becomes positive again.
If that is true then the following is true?
If the overdrive voltage of an nmos is 0.2, for example, and I forced Vds to -0.3 will the mosfet operate in sat with source and drain flipped?