That's no fun!
Nicknames are better.
I'll figure something out.

And, it's a sign of closeness for him. Or pettiness, if he's battling someone. He has a habit of giving his enemies the cutest sounding names.

I don't know what you're talking about!

That came out... a little quick. And is followed by some very awkward sounding whistling, that sounds like he's trying to play it casual but failing miserably.

Congrats, Danny! You just learned something new about your friend. He's terrible about lying, apparently.