In the negative, "not all there", it means "mentally incompetent; of low intelligence; absentminded".
"all-there." YourDictionary, n.d. Web. 23 October 2018. <https://www.yourdictionary.com/all-there>.
all-there. (n.d.). Retrieved October 23rd, 2018, from https://www.yourdictionary.com/all-there
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