I know from the IMDb that the term Luca used was a swear (ummm) and I can see why they chose to subtitle it as they did, to show the literal meaning of what Luca was implying through using that swear word; but it was just so funny, as when you don't know these things, you take them at face value. If anything, the ! mark was the icing on the face-value giggle cake.

Get a dictionary. Find out what this "closure" thing is. If that's what he's going to hit us with, I want to be ready.