9 times out of 10 if a chick does the following she is a fat chick:
1. Only has pictures of her face. Mostly at an angle or with the kissy face to make her face look thinner.
2. Breast or booty shots with no other part of her body showing. Fat chicks often take their best features and put them up so they can draw in attention while hiding the fact that they are 300 lbs. Not to mentio most fat girls have big t1tties that look pretty nice when perked up in her push up bra. don't fall for it it's a fat trap
3. Has food in her user name. Learned this from Tariq Nasheed but from what's i've seen 9/10 of the time it's true
4. Has old pics. You can't really tell this without asking, but most fat chicks will put up pics form when they were smaller in order to deceive males into thinking they are still as hot as they were in highschool. Don't fall for it. it's a fat trap
5. Has pics of a celebrity or anyone else but her on her profile. I don't care if trey songs is her dream man, if a chick isn't secure enough in her body to post her own picture then she is effed up or fat. This applies to family members to. Some girl will try to hide behind pictures of their hot friends/sisters in order to appear like a family girl but really they are just fat
6. only pics of her lips. Ties into number two. A lot of fat girls have nice lips
7. List her body type as "curvy, full figured, thick, or anything similar. Barring the honest fat chicks who say they "have a little extra weight" most fat chicks will try to sugar coat their weight by putting any of the least direct terms they can for it. Also be wary of the "average' body types. Sometimes they can downplay their weight as well. Hell, I've even run into and Athletic chick on okcupid who turned out to be bigger than I'd hoped....
It's best to just look at the pics when trying to get a feel for her, but just take note of the red flags. Most girls who are hot will have no problem showing you they are hot