The language spoken by, or when contacting, a purveyor of rare herbs and prescribed chemicals; particularly if they are of a paranoid nature. Often results in a conversation where neither of the two parties are entirely sure what is being agreed to.
"He was speaking dealerese so somehow agreed to paying 60quid for a half ounce."
when you looking up Wheeler Dealer in university and your mac freezes. You can't get it fixed because you don't want to show you were looking up Wheeler Dealer but you don't want to loose you work your Wheeler Dealered