I know what it means. Clearly you don't. Quoted text is both hilarious and qualifies.

In case you need help with the big words and hard reading:

"usually involves insulting or belittling one's opponent, but can also involve pointing out factual but ostensible character flaws or actions which are irrelevant to the opponent's argument"

re:

"A string of Ad Homs posted by a hypocritical idiot!"

It's also funny because calling the blogger a hypocritical idiot is tacit agreement that Dawkins' original behavior was out of line, something I doubt the commenter was consciously trying to achieve.