The act of raising one's knees while on the commode, leaving only the tippy-toes on the floor. The resulting position resembles a plie squat with feet in pointe, and isolates nerve endings in the sphincter to provide heightened sensation. This technique is preferred by those who enjoy butt-play as part of sex, especially during masturbation.
Spencer's boss complained about the amount of time he spends on the toilet, until Spencer explained he's a shit ballerina.
student that sits in the back row of lecture and does other homework, texts, eats, or anything other than paying attention to what's going on. Does better than you in the class.
student 1: "Yooo check out that chick sitting all the way in the back of lecture with her ipod and aviators"
student 2: "Yeah, and she beat the class average on that exam by like 30 points"