n.

1. Someone that always exhibits an attitude of fun and excitement in what he/she is doing. This person often is the life of the party and invited to events just because friends/acquaintances know they will have more fun if he/she is there.

2. Person lacking of standard excuses for not having fun or going out, such as: "i'm tired", "I have to get up early", "I have my kid tonight", "My spouse said i can't go out", "I drank too much last night"