The Jargon File (version 4.4.7, 29 Dec 2003):

feetch feetch
 /feech feech/, interj.

    If someone tells you about some new improvement to a program, you might
    respond: “Feetch, feetch!” The meaning of this depends critically on vocal
    inflection. With enthusiasm, it means something like “Boy, that's great!
    What a great hack!” Grudgingly or with obvious doubt, it means “I don't
    know; it sounds like just one more unnecessary and complicated thing”. With
    a tone of resignation, it means, “Well, I'd rather keep it simple, but I
    suppose it has to be done”.