When drag-and-dropping files, using a Mac, clicksie is the sinking feeling one gets after a series of misclicks that escalate in degrees of haywire, until something ridiculously unintended happens. Often with clicksie, something is stuck to the mouse pointer, or a file is mislaid after being dropped at that last millisecond before the window one was hovering the file over does that little move-around dance intended for convenience. Clicksie can also be caused by the confusion between playing, editing, and selecting titles in Itunes.
Not a serious condition, clicksie is often accompanied by lighthearted chuckling, and the word "ack".
*click* *click click* "aaack, clicksie!"