AppleScriptSpamMessages

tell application "System Events"
    set textToType to "f" -- text variable (textTotype) -- "f" is the message (change it to whatever you want)
    delay 3 -- offset

    repeat 100 times -- number of times to repeat -- to do infinitely, take off the number
        delay 0.005 -- messages interval
        keystroke textToType -- write messages
        keystroke return -- enter messages
    end repeat -- end repeat after number of time told
end tell -- end all