lafterbirth
Da "yucky 'n' sticky" post-romantic-fun effects (i.e., angry parents, a squalling baby, child-support payments, etc.) of one or more "giggles 'n' chuckles" encounters (i.e., a guy and gal making happy/amused sounds while intimately canoodling) dat resulted in da girl's getting preggo.
Regardless of whether ya spell it "lafterbirth" or "laughterbirth", it's definitely not "all fun and games" when da gal's abdomen starts to swell out!