twitlist noun 1verb 1forms 3 noun1 •(Internet) A kill file.A lot of the sexual or other harrassment^([sic]) I've seen happen is delivered by private e-mail. Is there any mail software out there that allows a killfile/twitlist for your private mailbox? — 1993 verb1 •(Internet) To kill file (a user); to add (a user) to a kill file; to twit. formstwitlisted · twitlisting · twitlists