To be sassy means to be bold, lively, and a bit cheeky in the way you talk or act. A sassy person might respond to a question with a clever comeback, roll their eyes playfully at a silly suggestion, or speak up confidently when others expect them to stay quiet. There's energy and spark in sassiness: it's not mean-spirited, but it definitely has attitude.

Imagine a friend asks, “Did you really eat the last cookie?” and you reply with a grin, “Maybe I did, maybe I didn't. What are you going to do about it?” That playful defiance is sassy. Or picture a character in a story who refuses to be pushed around, answering adults with quick wit instead of timid agreement.

The word often describes someone who's spirited and refuses to be overlooked or underestimated. A sassy response shows confidence and independence, though it walks a fine line: too much sass at the wrong time can come across as rude rather than charming. Knowing when to be sassy and when to hold back is part of learning to read social situations. Used well, sassiness makes someone memorable and entertaining. Used poorly, it just annoys people.