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GAFC means 'Get A Freakin' Clue', it's what you yell when someone acts like they're the only brain in the room and expects you to do their thinking for them.
My boss said, 'You should have known!' I replied, 'GAFC! I didn't even get the memo!'
My friend texted me, 'Why didn't you show up?' I said, 'GAFC! I didn't know the party was on Mars!'
My mom yelled, 'You failed math again!' I said, 'GAFC! I didn't know zero was a number!'