I am inclined to use the phrase "in during" to end some of my sentences. Here's an example:
I was headed to the library, and I've talked with my mom on the phone in during.
Does this phrase exist? Perhaps it is recently emerging? I cannot find it in any resource, so I'm afraid I might have just invented it.
It is usually possible to replace it with "on the way", especially when there is a verb for movement in the main sentence, be it explicit or implicit. However, take this other example where the subject is still, in which it feels like this "in during" suits better:
I was waiting for Judy in the lobby, and I've talked with my mom on the phone in during.
Of course, I can just rewrite the sentence and use "while" instead, but I really feel like using this phrase at some other times.