The phrase describes attire designed to be humorous and appropriate for individuals who are expecting a child and participating in Halloween celebrations. This type of garment utilizes the pregnant form as part of the comedic effect. Examples include a costume depicting a pregnant kangaroo with a baby joey visible in the pouch area, or a costume representing a character who is known to be pregnant, such as Juno MacGuff from the film Juno.
Such garments provide an opportunity for expectant mothers to engage in Halloween festivities in a lighthearted and memorable manner. They can also serve as a conversation starter and a means of sharing the joy of pregnancy with others. Historically, costumes that specifically acknowledge and incorporate pregnancy have become increasingly popular, reflecting a shift towards embracing and celebrating all aspects of life, including the physical changes associated with expectant motherhood. The humor often stems from either exaggeration of pregnancy symptoms or clever utilization of the rounded abdomen as a prop.