Planetary Impact

Alright, listen up, you big ol' dumb-dumb! This joke is based on something called 'hyperbole,' which is a fancy word for extreme exaggeration. You, my friend, probably use it every time you talk about how 'hungry' you are after a snack. The joke means the 'mama' is so unbelievably heavy and big that her jumping on Earth caused a tremor so massive, it actually made water appear on Mars. It's totally impossible, you simpleton, which is why it's funny!