Drifting so hard that you cross over into the D-Dimension (where everyone is dinosaurs who drift all the time and it's impossible to drive straight). It is only possible with an automatic Toyota Corolla (AE86) by switching from N(not drift) to D(drift).
Blake: But I saw you die!
Duke: No, I just drifted so hard I crossed over into the D-Dimension.
Blake: But that's just a myth!
Duke: No! It's real! We're all Dinos here. Everyone drifts, all the time. It's impossible to drive straight.
Gramps: He's going into Overdrift.