a person who is likely become extremely violent at any moment
They never suspected that he was walking time bomb.
by The Return of Light Joker January 26, 2012
A person with a very short fuse, about to lose his/her temper at any time.
Texas Tech Coach Bobby Knight is a walking time-bomb, he could lose his temper at any time, WATCH OUT!!!!!
by Saints September 20, 2003

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