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Not staying cool and in control. The opposite is to keep one's cool.
Don't lose your cool, man!

One will fail if one lose one's cool.
by jimmybone d May 27, 2008
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May 18 Word of the Day
When you think up something brilliantly righteous while baked.
X: I had this great highdea last night
Y: You clearly were philosopher stoned.
by TripleWest September 03, 2012
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