1. A newbie "Popstar", someone who's career hasn't lasted long enough to be taken seriously. 2. A young Popstar who has sabotaged/disabled his or her career through obtuse/criminal acts.
That "one kid" who is the smartest person in the class, but also has more popularity than the Minecraft caves and cliffs update. They are smug while maintaining a nice passive-aggressive for.
"You know the popsmart Carl? He's getting all the girls with his textbooks." - Some friend who needs a girl
When you shart your underpants ad have a gril lick it up and give you head while the fecies still in her mouth until you cum making a delightful treat.