Top Definition
N. A person who is born out of wedlock.

Derived from the idea that the act of premarital sex is a sin and therefore a resulting baby would be from sin.
"Brock is a sin baby and all his peers tease him because of it"

"I don't care if he's a bastard, I love me some sin baby!"
by Jay Jay Cool Whip February 11, 2010
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