Normaly asked when questioning some one at the front door or on the phone.
George: Did you hear the door bell ring?

Adam: Ya, who be dat?
by Digger September 3, 2005
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a phrase used to express confusion

origins: young african american women
"who baby dat?"(said in sassy tone while trying to determine ownership of a baby)

"The other day my math teacher asked me if I knew how to computer the volume of a cube and I was all like, "who baby dat?"
by gremlin1122 August 21, 2006
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From "Who dat say dey gonna beat dem Saints?", an exclemation or cheer that was taken from a song celebrating the hiring of head coach Bum Phillips in 1981. Also, a Saint's fan.

This term has been morphed into who dey by fans of the Cincinnatti Bengals.
The pope: "We just drafted Reggie Bush!"

Moses: "Who dat!"

by sore_bluto April 29, 2006
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Who is that? aka...a cultural thang...none of the NFL's friggin' business!
Who Dat say deh gonna beat dem SAINTS? Who Dat!?
by riBBz aka Kryptic Selektah February 4, 2010
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A saying chanted by fans of the New Orleans Saints. The full line is: "Who dat say dey gon' beat dem Saints?"
Person 1: Pardon me, sir. Could you perchance identify that loosely associated group of individuals loitering around over there? I haven't got my spectacles and my glaucoma is acting up something fierce. It appears as if they're carrying on about eating to faint, but that doesn't sound accurate. Perhaps you could clarify the nature of their business here while you're at it.

Person 2: You could have just said who dat.
by InYourEndo September 12, 2012
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A long time ago, people used to be embarrased when they had tickets to a Saints(LA football team) game. They would put paper bags over their head bc the Saints, honestly, were not very good players (besides Archie Manning).
Now, please understand, the Cajuns in Louisiana,(desendants from French, Spanish, and German colonists+Native americans in the area), had very thick accents.Sometimes, and I mean most older Cajuns have this accent, pronounce "this" as "dis" or "that" as "dat".
So the people would point at the fans paper bags and ask, "Who dat?"
There is also a singer that wrote a song with these words as lyrics a while back. In late 2009, a man by the name of Cracka Trax Ft. Dat Boi Pantha sings the song "Who Dat Say Dey Gonna Beat Dem Saints (Put The Hurt On 'Em)".He on the other hand was a Saints fan bc of how they played that season.They eventually went to the Super Bowl of 2010...Wait...We're all caught up now!I hope dey win!!!
Saints Fan #1: "Who dat say dey gonna beat dem Saints?"

Saints Fan #2: "Well, I'm preddy sho Brett Farves did, but look wha dat got em."

-Silence-

Both:"HAHAHAAAAAHAAAAAAAA!!!!!"

Example written in thick Cajun accent
by ACrazyCajunGal January 28, 2010
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