slash command 

A term for commands or actions that start with a forward slash ( / ).
Also written as / commands. Slash commands are used more frequently in World of Warcraft, and MMORPG, but have also shown up as memes on the Internet. One such meme slash command is /wrists, more than likely spoofing slash commands and emo culture at the same time.

To make a choo-choo noise in World of Warcraft, use the slash command /train.

slash command by EcoEclipse May 21, 2008