Sudsy describes something covered with or full of suds, those foamy white bubbles that form when soap mixes with water. When you wash dishes and the sink fills with puffy white foam, that's a sudsy sink. A sudsy bathtub is one where bubble bath has created mountains of bubbles. Your hair gets sudsy when you're shampooing it.

You create suds by agitating soapy water: scrubbing, stirring, or running it under a faucet. The more you work the soap, the sudsier it gets. Some soaps are sudsier than others. Dish soap becomes extremely sudsy with just a small squirt, while hand soap might need more vigorous rubbing to get really foamy.

People sometimes describe things as sudsy when they're not talking about actual soap. A sudsy movie or book is one that's light, fluffy, and maybe a bit silly, like a romantic comedy that doesn't take itself too seriously. Just as real suds are light and airy rather than heavy or serious, a sudsy story floats along pleasantly without much weight to it.