From this blog, in a post announcing the death of the blogger, Major Andrew Olmsted, in Iraq:
Anyone who does not respect his wishes, in this thread, will have his or her comment deleted. I am disemvowelling the one that has already appeared.
Disemvowel is a great verb. Modeled after disembowel, it refers to the making of objectionable text nearly illegible through the removal of the vowels. It is a tool for enforcing rules of respectful discourse without resorting to censorship. Sometimes the vowels are substituted with asterisks, rather than straight deletion.
An example of disemvowelling, taken from the same thread on the Obsidian Wings blog:
This left me infinitely sad, bttr t th lss f nthr lf fr nthng, dtrmnd t s n nd t ths stpd wr. Grg W. Bsh nd Rchrd Chn r th lckst ppl n th wrld - f thr wr n jstc t ll, w wld lng g hv strngld ths tw bstrds wth thr wn ntstns.
I hadn’t noticed the word before, but it dates to at least 1990. The practice even has its own Wikipedia entry.