In beer pong: The designated air-ball catcher, bounce swatter, blower/fingerer. Designated to avoid confusion between teammates when a situation stated above occurs.
Teammate 1: "alright man you're the ballerist this round!"
Teammate 2: "i got this sh*t!!"
In a game of beer pong: "Stopfucking texting! you're the ballerist, pay attention, catch the fucking ball"
Anxious parent of ballet student daughter, usually with acute control issues. Will lock the kitchen when she goes out, in case the swan-princess makes a dash for the cocktail chipolatas and can't be squeezed into her tutu for the class concert. Hates other people's children, and wants to keep her own daughter a child forever. Needless to say daughter is so busy battling self-esteem issues and eating disorders she never dances a step after the age of 10.
Paige: "Wow! Tracey's mum's a real ballet mother."
Diane: "Yeah, apparently she makes Tracey sleep in the splits and only lets her have cotton-wool for breakfast."
Paige: "Cool!"