Subject: That's borderline.
Author:
Posted on: 2015-02-17 07:27:00 UTC
Two ways, actually:
1/ Ist is a viable contraction of 'is it'. I'd normally stylise it as is't myself, but with something so idiomatic, I think Jay (I assume it's Jay) would be able to make a case.
2/ Ist is also a German word (meaning, appropriately enough, 'is' - 'Er ist grun', 'he is green'). Remembering how much Jay likes German music and random European references, I think that's a pretty plausible idiom for her all by itself.
hS