Bet you know the feeling after typing a really big text on neopets en it's getting blocked because you used swears!
I was getting quiet sick of it. And if you think you tackled every word like skills (kill) and what not. Then there always can be something wrong with neopets coding also. for example take the letitsnow avi. If you copy it directly form neopets. The will block it because of the word tits in it.
I always copy my big text in a program like word. With this program you can search voor specific words using Crtl + F.
And that's the way you can be sure you can make youre text swear proof. If you like to use letitsnow avi as a picutre, then you will have to upload it yourself without the word tits in in it!
I hope this anti swear guide helped you out!