Ok I did it like TGYoshi said (and learned how to use patterns in the process)...
local itemId, count, maxTextLenght, delay = 1111, 1, 15, 2 * 1000
local blacklistParam = {"god", "cm", "gm", "tutor", "tester"}
function onSay(cid, words, param, channel)
local text, continue = "You will be...