The Pig King can be found at the center of your servers Pig Village
This is almost exclusively found in the
Birchnut Forest Biome (it kinda looks like Autumn)
He can be found laying on wooden flooring surrounded by slightly strange looking obelisks and looks like this:
To strike a deal you simply need to hand over an item to him! This has to be done during the day as he sleeps during the night
He will accept almost all meat-based food items (except monster meat) in return for 1 gold nugget. He also accepts trinkets found from grave digging and in return will reward you on average 6 gold nuggets for each of these
When the option ‘Give’ is selected while standing next to him, the character will hand over the item and be showered in gold nuggets (the number of which is dependent of what item you gave him as mentioned before)
Achievement Unlocked! Congratulations!
Some notes:
You can kill the pigs in the surrounding village and destroy their homes - He doesn't hold a grudge against you, as he himself is invincible to all damage.
Best of luck!