I am pretty sure someone in this thread is using the term GAC squish for a completely different meaning than everyone else who plays this game.
I (and CG devs) use "GAC squish" to mean the scaling formula applied to the GAC population with the intention of maintaining the the divisions in each league at the sizes of 10/25/30/25/10. The old formula did not work, and they are working on those sizes again now.
I think someone is using it as a general term to mean "pressure to do well in GAC".