Literally means "Drift King". Usually refers to Keiichi Tsuchiya, the legendary drifter famous for driving (and drifting) the Toyota AE86 Sprinter Corolla/Trueno. Dori-kan is only used in a different sense when referring to someone producing drift like that of Mr. Tsuchiya (or perfectly in other words).
"Holy crap that's the REAL DORI-KAN! He's like... my idol!"
"Stupid people only know the term Drift King from watching The Fast and the Furious: Tokyo Drift. If anyone tells you 'wait, there's a real dori-kan?' then you know that they're n00bs in the sport."