Twittering: To send a Twitter message.
Twittermob: An unruly and ragtag horde of people who descend on an ill-prepared location after a provocative Twitter message.
Twittercal mass: A community that has achieved a critical mass of twitterers.
Twittermaps: A mashup technology that lets Twitter users find each other using Google maps.
Twitterrific and Twitteroo: Two services that let users post to Twitter using a Mac or PC.
Twitterpated: To be overwhelmed with Twitter messages.
Twitterrhea: The act of sending too many Twitter messages.