Zidane and Vivi having a conversation in Dali, Disc 1, when they were talking about the chocobo.

Vivi: Zidane? What's that?
Zidane: Oh, that's a panty. (Chocobo)

The bit when Eiko is trying to get the party into the Iifa Tree.

Eiko: Don't worry, I just told the panty to hurry up a bit. (Eidolon)