honest engine - Urban dictionary
Honest engine is like the triple dog dare of swearing or promises. If someone asks you honest engine you have to tell the truth and if someone discovers you lied on an honest engine you are an ass hole and they will never forgive you. Can be used as a verb, question, or statement.
Client: Are you really a 27 year old surfer boy?
Escort: Yes, really I am
Client: Honest engine?
Escort: Honest engine, I am a 27 year old surfer boy.