Xmog or making a dagger look like a one-handed sword trick. A lot of the players use this.
Second thing is what goes to the hack side more is this:
You can transmog anything on anything. Example a rogue with two 2h's
they way you do this is by using cheat engine and making the value different bla bla bla, not gonna tell the whole story. But is this bannable. For example ill make a rogue with 2 armageddons swords. Do i get banned for it?
But that does not mean it is not bannable. I haven’t enough fingers to count the amount of people I know that regularly use hacks. Never (or very rarely) has anything happened to them, but that does not make it right.
The (overlooked) bug only lets certain kinds of "illegal" transmogrification to happen, and they are known. The GMs have considered those fine.
Having something that doesn't falls under those would make it blatant someone used an external cheat to do it, which isn't fine and would get you banned if caught or reported.