Talk:Glossary/@comment-5003891-20141109014117/@comment-861160-20141109020712

It means to use fleets of all submarines on maps that were (for the most part) released before the full implementation of player submarines, and thus were not designed nearly well enough to prevent these compositions from being incredibly cost-effective compared to virtually all surface fleets. Common examples of maps that it's used on are 2-3, 2-4, 4-1, 4-2 and 5-3.

The term comes from the term "cheese" in RTS games where a unconventional, usually very quick-striking strategy is used to try to quickly steal a win off of an unsuspecting (and thus unprepared) opponent.