Your idea sounded about right actually. However, that's not the definition of mall that I'd use typically. I would try Dictionary.com if you wanted good definitions. If you were just looking around and were curious, that's fine.

"Scam on honeys" is definitely urban slang. This would be said in very,informal conversation spoken between good buddies. In urban areas "honey" is slang for a very good looking young lady. When two guys say they are going to scam on some honeys it usually means they are going to go out meet some good looking girls and tell them what girls like to hear, things like they are pretty and have a nice body. They usually don't mean the things they say, they are only saying it just so they can have sex with them. That is the scam.

As far as I can guess, the sentence means "to look at and try to pick up nice-looking girls". I really don't know anyone who would use such a phrase, so your English won't suffer by ignoring it.