/annoying or /annoy can be used
You may add/remove search "strings" easily. When a string is added, the addon will make sure that any chat messages containing any of the search strings you have specified will not be shown in your chat window.
Very handy for servers with a lot of spamming with items such as "Dirge" or "Warglaive of Azzinoth" etc.
This addon is still being developed, though should be working correctly. Please report any bugs or errors, and feel free to come with suggestions.