Sloshing

If you have observed water sloshing back and forth in a swimming pool, bathtub, or cup of water, you may have witnessed a small-scale seiche.

The water is sloshing about.

I wish I'd had something to eat before the beer, because now I feel it sloshing around when I move.

Mr. Thomas remembered that an airplane stewardess had served him a meal in a compartmentalized tray that kept the gravy on his mashed potatoes from sloshing over into his dessert.

He often bemoaned the glut of capital sloshing around the industry.