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One who is a well established member of a fraternity.

Can often be seen wearing Brooks Brothers or Ralph Lauren.

Will only drink beverages with alcohol, his tolerance is far beyond that of his peers, and often carries a flask.
I've never seen Josh in public without a polo on, he's a total fratdaddy.
by Fratdaddy-in-training December 30, 2009
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A member of a fraternity who is the shit. They are well known among the sorostitutes, and looked up to by younger fratlings. They only participate in the most of fratty activities including, but not limited to; hunting, deep sea/fly fishing and drinking frat water. Frat daddies are often seen driving a frathoe around campus, wearing their '80's RayBan's and a polo, scouting out new sorostitutes.
Do you know that guy in the Tahoe that just drove by?
What'd he look like?
He looked like an ultimate frat daddy, he was blasting Lynyrd Skynrd.
by AwesomeAl October 16, 2007
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A Frat Daddy may be interpreted as any member of a fraternity. However, A Frat Daddy is usually and should be interpreted as the highly regarded member in the frat who takes more Sorostitutes to pound town than any other frat member. A Frat Daddy should also take the responsibility of getting the kegs for any and every party, along with letting all the GDI's know that they are pussy-ass-bitches.
Most Frat Daddy's are members of Kappa Psi or Sigma Phi Epsilon
Drunk Sorostitute: Any of you guys want to roll me up into a fuck ball and take me to poundtown?

Frat Member: Yeah, I'll be your Frat Daddy for an hour.
by Robert88 October 13, 2007
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the highest ranked member of phi kappa psi at capital university. all the girls love him.
He's such a frat daddy.
We love our frat daddy.
by zeta-ta December 05, 2010
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A frat daddy is a member of a fraternity that think's he all that, but in reality, he couldnt even get a sorostitute.
The token fat guy in a frat who thinks he got in because he's cool, but he's really there to help the fraternity avoid accusations of descrimiation
by Buddy April 12, 2005
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