He is the earthy aspect of ITZAMNA and likes to get his hands dirty lurking in the dirt.
But it’s not all gloom and mud — he is also a fire god. His limbs are made of firewood and his tongue is a naked flame. Presumably he sticks it out a lot to impress people.
As an earth god with fire aspects we imagine he likes to tinker with volcanoes on a Sunday afternoon. There’s no smoke without fire.