He didn't kiss, he got kissed. Maybe it's a translation error or it's error by the author, but, strictly speaking, this is wrong.
found one:
Though I assume that they're memeing, because they only commented that this late into the manga.
And to legitimize mentioning
@DebuKaleng : he mentioned earlier, that he reverted at least 20 years, so he was prob. in his mid 20s to early 30s