What Does This Mean?

Kaylee

I was talking to a guy about 15 minutes ago. I was on the phone to him for the first time and it went well. So, after we hung up, he text me saying I had a pretty voice etc. He said I sounded nervous (I was 😂), I knew he was nervous too. Anyway, told him that he also sounded nervous and he replied “I just bit my tongue 😂 it’s split open. I swear I’m not stupid 😂”. I’m not too sure what he means by this though?