haxit is definitly possible. Your devs could probably do it in like 10 mins. With the toggle and cooldown probably longer. it would be some simple lines added to the chatfilter to display the message.
Also since it would react to thinks like hacks killaura fly etc Why dont we all try to figure out as many words as possible for the system to be effective. Below this reply try to think of hacking related words people say in chat when they see a hacker. Let me start with the most obvious ones:
hack
hacks
fly
flight
killaura
report
If you got ideas reply below.
haxor
h@acks
h4cks
h@x
h4x
h4xor
h@xor
hax0r
etc.. Yeah there are a huge load of words for that.
(This also proves why the censorship of words like: hacker, hacks are totally useless and only cause normal sentences to be censored out of the blue, but who am I to say that it makes no sense?)