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About
Based Department is a phrase typically used to express that another person’s actions or post is considered based. It used as if a person is receiving a phone call from a fictional "Based Department," such as "Hello, Based department?"

Origin
"Hello, Based department" began from users on various 4chan boards using phrases such as "hello, epic department? I'd like to file a claim" since at least April 21st, 2016. A snowclone, "Hello X department?" emerged from this trend.