twiggy: yo, did you see aubrey classterbating in chemistry?  zach: yeah, she was sweating like a whore in church
classterbation: the art of girls crossing their thighs over their pussy and flexing their thigh muscles, which scrapes their jeans over their clit
"twiggy: yo, did you see aubrey classterbating in chemistry?  zach: yeah, she was sweating like a whore in church" What is the definition of "classterbating"?