This item is found only in the mobile version(s) of Terraria.
The Strange Looking Tombstone is a new tombstone that can be obtained once the player has a Pet Worm active. When the player dies with their Pet Worm, it will exclaim, "Bye bye!" before turning into the Strange Looking Tombstone, which will appear before the player despawns.
This item is based on a gravestone from the popular game series Worms.