To back off, to go away, to beat it, to piss off.
Inherited from Ottoman Turkish دفع اولمق (defʿ olmaḳ), from Arabic دَفْع (dafʕ), equivalent to def (“an act of pushing away, repelling, expelling”) + olmak (“to be, to become”).
Practice speaking and memorizing "defolmak" and many other words and sentences in Turkish.