What does “Those hallucinations like go on tangents of each other it's so insane” mean?

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A "tangent" in a conversation is a new topic that is unrelated to the one before it, that somebody thinks of because of one small detail of the other topic. It's like a line that touches a circle at exactly one point.

The person is probably talking about taking psychedelic drugs, and when you see something happening in a hallucination, it makes your brain think about something completely different, which triggers a new hallucination.

Side note: The person who wrote it was lazy with their punctuation. It should have been written like: "Those hallucinations, like, go on tangents of each other. It's so insane."