Why and who said "eat your Dasein"?

Lacan

In this article, I will underline some simple concepts in Lacan's reading of Poe. These concepts are so simple and so tightly connected to the practice of psychoanalysis that secondary literature tradition seems to have lost the essential dimension of Lacan's comments. Thus my claim is that these well-worn zones of Lacan's corpus are not so well worn at all. In order to do justice to the technique of psychoanalysis and to explain its singularity in contrast to all the other therapies (from drugs to different "psycho-social" therapies) we have to return to the basic questions behind Lacan's statements on the arrival of the letter at its destination and the necessity to eat one's Dasein.

http://www.lacan.com/symptom6_articles/thetasteofdasein.html

Jacques Lacan said it, in his seminar on Poe's "The Purloined Letter," in an apparent reference to Heidegger's concept of "Dasein." (Fundamentally, the word just means "existence" in German.

As for what Lacan meant, don't ask me. I've long been convinced that he himself didn't know what he meant much of the time.


http://www.lacan.com/symptom6_articles/thetasteofdasein.html

I think he was referring to endo-cannibalism here.