Many refers CoH to City of Heroes but it's also shortness for the very popular RTS-game Company of Heroes.
Company of Heroes (CoH) is a real-time strategy (RTS) computer game developed for Microsoft Windows by Relic Entertainment. It was announced on April 25, 2005, released on September 14, 2006, and was the first title to make use of the Games for Windows label. The game was released on Steam on July 17, 2007.
A standalone expansion, Company of Heroes: Opposing Fronts, was released on September 24, 2007.
Player1: I'm gonna play CoH.
Player2: Company of Heroes?