When you are notorious for sucking bodybuilding cock, trolling gyms in hopes of being noticed and looking for attention from men on bodybuilding forums.
It can also mean someone who considers themselves getting ready for a show, but is always fat.
Example 1. Random bodybuilder finds a piece of ass at a gym or on a forum, he can say I scored me a chicagogirl aka. Erin, no matter the girls name or location.
Example 2. A girl is fat , eating on her treadmill and says she is prepping for the next show. You can say, hey, look at that chicagogirl prep over there.
Chicagogirl can be located at MD forums or RX. Probably a ton of others when looking for a bull fix. Very visible close to showtime.