This may be obvious, but....

[_Cass_]

Why don't we say the wretched spe****** word???
The funny thing is I probably already know and it sllipped my mind LOL
LOL. I feel so dumb.

 

[nofearengineer]

I'm sure it's because of all of the spam associated with that word, and the other word that rhymes with "Niagara".

 

[Dj tweet]

???? I'm lost

 

[nofearengineer]

Many forums filter out the words c-i-a-l-i-s and v-i-a-g-r-a to keep the spambot clutter to a minimum.