Definition: A young person who studies too much.
Example: 1) Tim is a world-class poindexter, complete with glasses,
dorky clothes, and a bag full of books.
Etymology: 'Poindexter' sounds like the name of a kid who studies too much.
The Amazon.com Review of the book "The Dictionary of American Slang"
Poindexter used on line 3 (emphasis mine):
Dollars to doughnuts, your reference shelf lacks a good slang
dictionary, and that's a fine how-de-do. Whether you're a stuffy
writer looking to gussy up your prose, a _POINDEXTER_ who thinks
studying dictionaries is the cat's pajamas, or a muttonheaded fogey
hoping to get a clue, Robert Chapman's Dictionary of American Slang
fills the bill. Containing more than 19,000 terms of American slang,
this lexicon represents all periods of American history, from phrases
out of the 1880s, such as carrot-top for "redhead," to current '90s
jargon such as carjacking. It covers the widely acceptable and the
taboo, slang from cowboys and railroad workers and slang from rock &
rollers, corporate America, and the gay community. It includes
obsolete phrases such as canoeing for "making-out," and up-to-date
terms relating to technology, such as listserv for "electronic mail
list." Each item features pronunciation guides, word origins, and
usage examples, and words that are derogatory or impolite are clearly
labeled as such. A righteous reference and a lulu of a browser, the
Dictionary of American Slangis an elegantly produced and scholarly
rigorous linguistic knockout. --Stephanie Gold