all there meaning

adj.

sane; mentally alert: He's not all there. (= a bit crazy) • That old lady is all there. You can't fool her.

[American slang]
Fig. alert, aware, and mentally sound. (Usually negative.)
  After talking with Larry today, I get the feeling that he's not quite all there.
  You do such foolish things sometimes! I wonder if you're all there.

Examples

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1. he is not quite all there these days.
2. i have said all there is to be said about it ...
3. he was drunk, and that is all there was to it.
4. might is right, and that is all there is to it.
5. that 's all there is to it.