To respond by losing one's sense of perspective and becoming agitated in the extreme.

Possibly borrowed from meteorology. A cellular storm "goes linear" when it turns into more of a squall line (or merges with an existing storm) -- i.e., that it's going to turn into a big black line of death. (from stormtrack.org).

I have a sense that there should also be a nuclear physics metaphor, but I don't know it.
My boss went linear when I showed him my expense report.
by jfkelley October 12, 2009
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