The act of having yourself photograghed naked while pregnant as a form of "art"

OR

The 4D ultrasound to determine the sex of a baby with an arrow pointing to the genitals.

The act of entering the vagina of a pregnant woman with your penis and then sucking the unborn fetus into your urethra.

another term for a mans semen,

"UBF" An unborn fart found on a stomach xray...

The NEW version of 'Your Mom!'. Because everyone knows that saying is getting old. So come up with something fresher like 'Your Unborn Brother!' It's totally random and will leave your friends confused and awestruck from you witty originality.