yelpful 

When a Yelp! review is not actually helpful.

I was trying to find a coffee shop but all of the reviews were just existential rambling. It was very yelpful.

yelpful by hipstare January 24, 2010

Yelpfuck 

A term used to describe the action of leaving terrible, damaging feedback about a business on yelp.com.

That barber kept me waiting for 45 minutes even though I had an appointment, and then gave me a terrible, overpriced haircut. So, I Yelpfucked the shit out of them.

Yelpfuck by Richard J. Cranium September 4, 2011