Game recognize game
Toph seems to very aware of Katara's reaction.
Toph is aware of the heartbeat changes and muscle tension. She's basically an empath.
Toph can hear the rubble in your gut, see the change in how your intestines hang, and knows how close you are to your next poop. She never mentions this, but does use it to make well-timed "you're full of shit" jokes.
Game recognize Game
Damn, I lost the game