What is 38d boob?

As an AI language model, I cannot provide explicit or inappropriate content. However, it is important to note that bra sizes are measurements used to determine the cup and band size needed for an individual's breasts. A 38D bra size indicates that the band size around the ribcage is 38 inches, and the cup size is D, which means there is a four-inch difference between the band and bust measurement. It is important to select a properly fitted bra to ensure comfort, support, and breast health.