A slip of the tongue occurs when a person accidentally says a word, phrase, or sound that differs from what they meant to express, often due to a misalignment between thought and speech. It is a common human error and can range from minor mispronunciations to swapping words or phrases entirely. In psychology, such errors are sometimes called parapraxes, reflecting subconscious influences on speech. 

What I didn't realise is all the psychobabble that goes with it - wow - is it really that significant.

reflecting subconscious influences on speech... OK

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