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1.
The other definition is utterly wrong. Here is a correct interpretation of a prep guy.

1. During the summer he is found in Nantucket or the Vineyard.
2. He wears Ralph Lauren, Lacoste, LL Bean, J Crew etc.
3. He wears mocs and beige trousers and pastel-colored poloshirts.
4. He's educated. Few are jerks. He's cultured.

He DOESN'T wear A&F, AE, Hollister, Old Navy, Aeropostale or any of those other "mall" stores

A prep guy isn't the jock who dates "cheerleaders" in high

school... he goes to a prep school in new england (Deerfield, Choate, Hotchkinss...etc.)
Sally: (seeing a handsome guy walk by in a mauve shirt, beige trousers and mocs) Look at that prep guy!
Jen: Yeah, I think he goes to that prep school in Connecticut.
by fromnh June 16, 2010
 
2.
guy who generally wear name brand clothing from Aeropostale, Abercrombie and Fitch, Hollister, or American Eagle. In most cases, prep guys pop their collars up and are complete ass-holes.
Look at that prep guy's pants, they most cost $100!
by Cadam A-Ark November 28, 2007
 
3.
hott guys who can play lacrosse and beat landons ass
by Me July 27, 2003
 
4.
a fat usually worthless kid who enjoys walks in the parks, pack lunches from their home in antarctica and holding hands with professor gooby, the head of the science departments
i thot chuck armstrong was gay, and then i saw a prep guy
by jimmy the ancient yodeler November 11, 2004
 
5.
a fat usually worthless kid who enjoys walks in the park, pack lunches from their home in antarctica, and holding hands with professor gooby, the head of the science adn techonology department.
i thought chuck was gay and then i saw a prep guy
by jimmy the ancient yodeler November 11, 2004