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1. British Military slang for a person who did something stupid that resulted in the delay or cancellation of something important. Also known as a space cadet in some circles.
Dave: 'Shit I forgot my passport. Its at home 500 miles away'
Tony: 'Now we will miss our flight!'
Dave 'I know, I'm a complete Spaco Johnson!'
by captianstabber May 20, 2014
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