Signing and cussing

Kes holds out her thumb, forefinger, and pinky, and says, "Mommy, what does this mean?"
Me: "I love you."
Kes: closes up the pinky "And what does that mean?"
Me: "That's an L."
Kes: closes her fist and holds up her middle finger "What does that mean?"
Me: "That's a bad word sign that people use to tell other people that they're really mad at them."
Elly: "What's the word???"
Me: "I don't want to tell you the word because it's not appropriate for children to use it."
Kes: "Is it poopy-butt?"
Me: "No, you have never heard it before because grown-ups don't use it around children."
Elly: "Is it poo-gas?"
Kes: "Is it tuchis-boofer?"
Elly: "Is it booty-bumper?"
Kes: "Is it poopy-booty?"
Elly: "Is it poo-poo guns? Is it stupid-butt?"
And so on...