Okuyasu was 100% taking selfies with giant tortoises and trying to send them to Josuke to taunt him.

That was also 100% not working, because Josuke was in 1999 and had a 1999 cell phone.

So instead Okuyasu was going to have to save those pictures and just taunt Josuke with them in person. Because when your best friend is creeped out by turtles, you take pictures of you hanging out with giant ones.