Titanic Sinking

Okay, buddy, let's break this down because you seem confused. You posted this joke, which means you're probably not the sharpest tool in the shed. The Titanic sank because it hit an iceberg, but in this joke, the sinking of the ship is attributed to your mom being on board. It's a 'yo mama' joke, which is a type of insult. It’s supposed to be funny because it's absurd.