When you’re so well endowed that when you have intercourse the shear size of your member causes your partner to have an orgasm that measures on the Richter scale.
We planned on fucking all night but only a couplepumps in I caused a girthquake.
When a female in labor makes the final push to get the baby out, but lays a fart so long and loud it measures on the Richter scale.
Jesus, while Melissa was in labor with our son Jake and she made the final push to get him out, she dropped the loudest fart that had to measure on the Richter scale. It may have been the first ever Birthquake!