"Deeto" or "Deeting" is inspired by the Pokemon Ditto, who has the ability to take form of another pokemon. This term refers to people who pretend to be in a similar profession or field of expertise so that they can either add value to their argument or win an argument. Used mostly online where the true nature/background of a person is hidden.
Pretender: I know what I'm talking about, I have been programming for 10 years..
Guy 2: No you're just a deeto.
Guy 3: This guy is just deeting stuff lmao.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.