A NARUTARD is someone who only started liking the series after it was localized on Cartoon Netowrk. They flock conventions in terrible Naruto cosplay, made from regular clothing, and wear their cheap Hot Topic bought headbands.
They have a distinct lack of knowledge of the series, even going as far to state random misconceptions that haven't yet occured, such as Sasuke and Sakura getting married, or such and such kills such and such.
They also make no attempt to read the manga, or watch subtitled episodes of the japanese version, which is far ahead of the rest. They are also just recently learning about the 'newer' shippuden series, which is as old as dirt as of lately, and are still unaware the Sasuke and Sakura will never happen, because there is a bony hipped megane rapist named Karin, who loves to molest Sasuke, and punch Suigetsu in the face.
They also have a apparent lack of regard towards other anime that aren't on cartoon network. They have recently flocked over to Bleach, or even Deathnote, despite not having the mental capacity to understand a single episode.
They also fail to awknowledge that Naruto is not the single best anime of all time, and that there are other, much more prominent anime, such as Rozen Maiden, Haruhi Suzumiya, Lucky Star, Negima!? and Pani Poni Dash (Which all scored sufficiently higher, with the exception of Lucky Star, which had not yet debuted, on the 2007 TV Asahi Polls.)
Person A: OMG SASUKE DIES HE GETS KILLED MY OROCHIMARU.
Person B: ... Other way around, Narutard.
Person A: NARUTO KILLS OROCHIMARU WITH THE HELP OF SASUKE!
Person B: No. Freakin' Narutard! You don't know anything!
Person A: THERE'S NO FEMALE IN AKATSUKI, IT'S ALL YAOI.
Person B: No. Her name is Konan, and she's like Yomiko Readman.
Person A: Yomiko Readman? WHO THE HECK IS THAT!?
Person B: Agh, fricken Narutard! She's the Megane Queen?
Person A: Megane?
Person B: ....... -pulls out cleaver-