its a word play type thing. it means that there is a women who has a child every 80 seconds. its kind of dumb. not too funny.

They're saying that ONE woman gives birth every 80 seconds, not that a baby's born every 80 seconds. Word play :D

Ok so what this would normally say is that a baby is born every 80 seconds. Pretty normal everyday stuff. But the joke is how it's worded. It's saying that "a woman" meaning one woman, is giving birth to a child every 80 seconds. So she has a kid... 80 seconds later... same woman has another kid, and so on. I think that's the best I got, if you still don't get it then I can't help you.

It's a joke, it doesn't have to be accurate.

Don't feed the trolll...