Named after the /gu (guild-chat) command in that perennial MMORPG EverQuest? - a series of single panel jokes.
These jokes are, often, entirely incomprehensible unelss you also follow the daily 'news' about these games. Other times, the jokes are more generic to the gamer 'community' - or are just rants about specific features of these games which irk the author.
The recent strips, at least, tell you with a title which MMORPG they are mocking. Older ones just let you guess.
Not often hilarious, but well drawn and poking fun at things which deserve it.