It's "probably." It's one of the terms recently decried in a thread about the wrong words. It also was used a bunch in 2015. Someone seems to have fallen in love with it at that time. It never impressed me as clever enough or funny enough to use.
On the other hand, I sometimes write "frinstance," because that is truly how people say it. I also enjoy the joke of writing "viola" when I mean "voila." Don't try that out loud, though: it just creates an embarrassed silence because it's not understood to be a joke.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
