In Jujutsu Kaisen's episode 15 "Kyoto Sister School Exchange Event—Group Battle 1—" (Transcription: Kyōto Shimai-kō Kōryū-kai—Dantai-sen ①—; Japanese: 京都姉 妹校交流会—団体戦①—), when the Goodwill Event between the Tokyo and Kyoto schools is being kicked off, Gojo Satoru invites Utahime Iori from the Kyoto school to say a few words. She fumbles due to being put on the spot so suddenly, and then Gojo cuts her off anyway by saying that they are out of time, and that the Goodwill Event is now begun. Before the mic cuts off completely, we can hear Utahime exclaiming in frustration at Gojo's antics.
The scene then cuts to the trio—Itadori Yuji, Fushiguro Megumi, and Kugisaki Nobara—sprinting together in the woods. At this point, Yuji looks at the other two and asks, "Was that Ichiro?" to which Nobara replies, "Idiot."
Presumably, Nobara is referring to Gojo here, as it seems to be a common way of referring to him informally among themselves. For instance, when the Kyoto and Tokyo students meet for the first time as a group in the previous episode, Gojo (who is not present there) is referred to as "that idiot", and Megumi even points this out explicitly.
However, what does Yuji mean here by asking, "Was that Ichiro?" As far as I can tell, no character by this name has been introduced so far, and neither does the name Ichiro appear anytime later. Is something being lost in translation? From what I can make out, the dialogue in the Japanese dub goes as follows:
Of course, I could be hearing something incorrectly, but there is definitely not much going on here that could be mistranslated.
Question: What does Yuji mean by his question, "Was that Ichiro?" to Nobara and Megumi? Who is Ichiro?