Definition: The phrase "CacheBoy_1.5.PRE4" is a slang term that refers to a person who has recently been diagnosed with a serious mental illness, such as schizophrenia or bipolar disorder, but seems to have managed it by hiding it from their immediate surroundings. The phrase is often used in a humorous or sarcastic way to describe someone who's going through a tough time and does not want to be seen or recognized by people around them.
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