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"propellerhead"
used to mean any kind of a geek - history, science, aviation, baseball, younameit.
Then it meant a computer geek, either a cutting edge trendster or a bs artist who is great with concepts but cannot code.
It today means "someone likely to advance quickly in an organization."
A brown-noser, an apple-polisher, a 100%er, a drinker of the kool-aid.
The last thing such a person would do is wear that hat.