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1.
An individual who contributes so many reviews to Yelp.com that it is nearly impossible that the person ever left the computer in the first place, let alone try the place that is reviewed.
Billy just wrapped up his 700th reveiw on Yelp.com. Its the 60th sushi place he has reviewed, fucking yelptard.
by nuclearadam August 30, 2007
 
2.
Noun: An individual who contributes so many reviews to Yelp.com that it is nearly impossible that the person ever left the computer in the first place, let alone try the place that is reviewed.
Billy just wrapped up his 700th reveiw on Yelp.com. Its the 60th sushi place he has reviewed, fucking yelptard.
Source: nuclearadam, San Francisco
by NuclearAdam September 10, 2007
 
3.
A yelp reviewer who visits a location many times with no positive reviews, then upon a single negative experience will leave a bad review.

Also, someone who uses yelp only when they have a bad experience, ie a vengeance yelper.
example review from a yelptard: "I have been coming to this place for years, however the last time I was there I got a dirty fork, so for my first review of this business I am leaving a one-star review"
by rwatts March 28, 2014