[Aang turns around to face Katara with his brightest grin.]

Hama, that weirdo? That was a long time ago! That explains everything! I'm from the future... over a year after we kicked the fire lord's ugly butt! And that explains why you don't know what I mean by "sweetie"! It's...

[Aang feels some sweat accumulating on his forehead, matched with a small drum in his chest.]

...it's something we say to... make fun of Sokka! It was something really funny, trust me, you had to be there!