Sassy

[Sarah]

possessing the attitude of someone endowed with an ungodly amount of cool.

[Sarah]

Someone who is full of themselves but in a good way. Theyre cheeky, lively, smart, saucy, slightly impudent, mouthy, cocky, energetic, loud and extremely talkative.

[Sarah]

Someone that is just the coolest person ever, and uses sarcasm in the coolest and funniest of ways. Most sassy people are very lovable.

[Mark Zuckerberg]

Lively, bold, and full of spirit; cheeky.