a kind of apology for having named a poor exemplar of some category or class.
Sara: Hey, do you want to smoke up
with us, Melissa?
Melissa: No, thanks... probably a good idea if at least one of us keeps a clear head, such that it is, tonight...
(in this example, Melissa uses "such that it is" to indicate that her head may not be the best example of a clear one even unimpaired by marijuana.)
Margaret: George, show Carla your penis
... such that it is.
(In this example, Margaret is a humiliation dominatrix
commanding George to present his penis
to a third party for evaluation. Margaret uses "such that it is" to indicate that George's penis
is in some respect not worthy to be counted as a penis
, at all.