When a person says something stupid or outrageous, the accuser says "slap no babies" and gets to slap the victim repeatedly on the back of the hand until the victim says "babies." If the victim says "babies" before the accuser says "slap no babies," then the victim does not get slapped.
Anyone that hears the victim say something stupid can call "slap no babies" and slap the victim.
Accuser - "Do you play any sports?"

Victim - "I play roller hockey"

Accuser - "Slap no babies, roller hockey is not a real sport. Plus you're gay"

*accuser slaps victim*

Victim - "Babies"
by Assclownn April 15, 2010
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Because she was too tired to stay at the party, Jill wanted to slap the baby and go to bed.
by Penndog July 17, 2012
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Off spring conceived by dubious actions of the mother, stealing fresh sperm from her partner's used prophylactic and slapping it in her vagina.
He didn't want kids, so she got herself a slap baby.
by Clara Clayton July 22, 2016
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