1 definition by The Internet Is Porn

Pregnant. The idiom bun in the oven refers to pregnancy. The “bun” is the baby, and the “oven” is the mother's womb. Perhaps it alludes to the warmth and shelter the mother's womb provides.
Teacher: "Kids, I have a Bun in the Oven"
Kids: "YAY, I WANT A BUN! GIMME"
Teacher: "I'm Pregnant."
Kids: "AW I WANTED BUNS!"
by The Internet Is Porn December 19, 2019