The members of the whodat nation will frequently yell "whodat" for no particular reason.
Chicago Bears fan: "WTF did you say? Huh? Katrina should have swept you away... *starts cursing profusely and making more nasty Katrina remarks* "
Saints fan: "STFU - the Saints will demolish the Bears this year. The Saints will make your bears look like week koala bears smoking dope. As a proud member of the whodat nation I hereby bitch slap you - *POW* - WHODAT!"