Pull out your galoshes. When it's been raining for days, there are puddles everywhere, and the grass is thoroughly soaked, it's safe to say the ground is sodden.
Coming from the Middle English word for "boiled," sodden is certainly closely tied with lots and lots of liquid. Saturated, soppy, and soaking, anything that's sodden is drenched to the core and probably a mess. That goes for people, too: You can call someone sodden if they're acting foolish or dull, especially if they've had too much to drink.