a bun in the oven
when a woman is pregnant, and it’s like a baby is cooking inside her, and she’s probably eating everything in sight
My cousin is a bun in the oven. She’s been eating ice cream like it’s her job.
She said, 'I’m a bun in the oven, and I’m not backing down.'
That lady is a bun in the oven. I can smell the baby from three blocks away.