Sound resulting from
impact of end digit of one's middle
finger against one's ring finger when latter is rested upon base of one's thumb, resulting from middle
pressed at angle against ball of thumb until pressure
overcomes friction of contact between middle
finger and thumb, at which time inertial friction yields to pressure
finger alights rapidly
upon ring finger; NOTE: all actions described occur in single hand. Word.
Yo 'sup can you snap? Didn't think so, fool.