When you're fucking a pregnant girl and you activate your vacuum penis. The fetus and your penis have a tug of war for supremacy inside her womb. If you win, you suck her fetus through your urethra and into your stomach, so it can be digested later for sustenance. If you lose, the fetus tears your dick off and you leave humiliated.
Wow man, I can't believe she let me hit her with the good old Tallahassee Tug of War.