Farting/Curved Air
Quite simply, the act of firmly cupping one hand in the bumcleft in synchronitity with a boff, and then rapidly arcing the arm around in an economical sideways/forward/upward motion in order to give direction and purpose to the otherwise diffuse fart-gas. Best directed towards a classmate's face.
With reference to prog-rockers Curved Air who stank and got in your face, or something.
written by Sm*ler *mil*sy, approved by Susan