I heard this on a podcast the other day to mean that the conversation had gotten stuck. I looked it up and it seems to be a reference to the textbook Ecce Rómání, in which a cart gets stuck in a ditch for a while, apparently—given how many references there are to it online—to the amusement of decades' worth of Latin students. However, I couldn't find any references to it in any authentic Roman/Latin texts.
I'm wondering: is this an actual Latin saying/metaphor that the Romans or other Latin speakers used at any time in history? Or has it just become a thing because so many people learned Latin from Ecce Rómání?