Underneaths

LOACH: Was it to do with her underneaths? ASH: I'm sorry. LOACH: To do with her womb, was it ?

Source: wiktionary

Where does he keep the seed? In his underneaths. Why? Oh, it's a good place to keep it. How does he plant it? He just puts it in. Where? In my underneaths. How does he? He just pushes it in. And then I keep it in my tummy, and when it's ready it comes out and it's a baby and then it grows into a boy or girl and then into a man or woman.

Source: wiktionary

Again, she says to her Daddy, "Your underneaths shake, Daddy; mine don't shake"; and later on, to her mother, "Are your underneaths like my underneaths, Mummy?"

Source: wiktionary