blow one's top

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blow one's top

1. Also, blow one's stack. Fly into a rage; lose one's composure. For example, If she calls about this one more time I'm going to blow my top, or Warren is generally very easy-going, but today he blew his stack. The top here has been likened to the top of an erupting volcano; the stack alludes to a smokestack. [Slang; first half of 1900s]
2. Go crazy, become insane, as in When she regains consciousness, she just may blow her top. [Slang; first half of 1900s] Also see flip one's lid.
See also: blow, top