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"