Definition of zap:
(n) :
a sound made by a sudden release of
electricity or some similar
energy; an electrical shock
"you might feel a little zap touching a metal doorknob when the air is dry."
"they spent the whole movie zapping bad guys into oblivion."
(interjection) :
representing the sound or action of a zap
"then the computer went zap and I lost all my work."