A baby that was created by accident, a mistake, a regret the parents always have. Usually caused by the condom breaking and/or large amounts of alcohol and/or drugs.
Bman you're a god damn oops baby, you're parents don't even love you.
by jenkem November 19, 2007
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A baby created when a woman tells a man she is using birth control, but she is not.
He'll be paying child support forever -- she had an oops baby six months after the divorce.
by Insect God February 15, 2009
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What there are too many of: babies that were born to a couple that didn't intend for a baby.

The result of unprotected sexual encounters. Many men are suddenly out of the picture when one of these comes along.
A man (in disgusting cowardice) just goes on his way, leaving the woman to raise their oops baby on her own. If you're not ready for the responsibility of parenthood, then you shouldn't be having sex.

Contraceptives and abortion are two of the few ways to avoid oops babies.
by Lorelili January 27, 2006
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The youngest child of a family, usually with a large age gap between that child and the next youngest. Generally a product of a mom who had the kid in their 40s or later.
I had my first three kids in my 20s. I thought I had entered menopause when I turned 40 as I stopped having my period. But it turns out I was pregnant with my "oops baby."
by unsolicitedadvicelady August 25, 2017
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