A baby formed from filthy and/or dilapidated used condoms that inseminates an ovum in the grimy gutter or trash receptical in a major metropolitan area. The ovum is usually the result of 1 day or more old hooker vaginal secretions.
No two humans exist that could naturally spawn something as filthy as you; you must be a chud-baby.
A baby miraculously conceived through anal intercourse. The sperm, possibly through osmossis, makes its way to the baby-maker, where the fetus develops. The baby, then, travels back into the ass, where it is born through the butthole, presumably covered in shit.
That chud baby smells like shit. Throw it in the trash.