Here's a sentence from a patient speaking to her youth psychiatrist:
Weil Sie auf das, was ich sagte, keine Emotion zeigten, nur eine Antwort ausspuckten: Blob. (Source: DIE ZEIT ONLINE, 1 December 2016)
What is the meaning of the term "blob" here (and are there any other meanings), and what is its etymology please? Is it correct to assume that this is a rather informal term?