1. No idea -- I'm honestly not sure if people follow American shows in Japan to that degree of fandom. It would likely be a slang word, as well.
2. Hm...
Atari-mae might work (it means "obviously") but I would use a quick grunt of acknowledgment (you're listening, but you don't care enough to make a proper response). It's more of a body language and intonation response, just like it would be in English.
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