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A fake reply to someone who says something so obvious it makes you want to punch them. It’s like saying you already knew the punchline before the joke was even told.
'I totally already know that', said after my friend yelled 'I SAW THE MOVIE LAST WEEK!' during a movie night.
'I totally already know that', texted to my cousin who told me the same story from last year.
'I totally already know that', said to my mom when she reminded me I left my phone in the car again.