The sound made by robots when they are deactivated in the comic book "Magnus Robot Fighter". The comic began publication in 1963 by Gold Key comics (and was revived in 1990 by Valiant Comics). Magnus frequently uses his brute strength to decapitate robots, and the action is typically accompanied by the written sound effect "SQUEE" (the quantity of the letter 'e' sometimes varies).
(Magnus chops a robot's head off)
Robot: Squee! (deactivates)