what does "unspooled"mean?
The even-keeled Jerry Ford once got so mad in the Oval Office that he hurled a pencil across the room. George W. Bush was bracingly informal and blunt on occasion. Ronald Reagan loved to tell jokes and Hollywood stories that contained kernels of wisdom if one listened closely. I knew a then-future president who became so upset about something he read in the press that he almost unspooled himself in my office, screaming and carrying on about some minor mix-up.

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It officially means: unwind or cause to unwind from or as if from a spool.
"he unspooled the tape from the casing" - here it is used as an analogy, saying how he became very upset, became undone, lost his cool, was unravelled - I'm sure you will never use this odd word ever again! :)

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