'Class X' refers to the graduating class of 2010.
The 'X', representative of the roman numeral is not only a badass symbol, but a popular motion made with one's arms.
The origin of the X is unknown, however it's addition to the greatness of the SEN10R class will be forever remembered.
500 seniors at the homecoming pep rally chant "CLASS X!" with X arms.
Junior: "I hate holding up one finger on each hand like i'm looking to pick my nose. I wish I had a motion as cool as that of Class X.