1.Used for a person who is a real sneaky motherfucking fuck. Sometimes when somebody betrays you in a very genius way you can call them "Tokhmejen".
(Persian, Noun, impolite)
2. Used for a really clever person who sometimes does things that are not completely accepted or legal. This usage is impolite but is not really offensive most of the times.
merXad: you mean the bitch who stole money from my fried?
Sam: Yeah that Tokhmejen motherfucker!
merXad: I couldn't do shit about it...