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3.
In a debate (or perceived debate) a casual remark that sounds like an insult, and is perceived as one.
Norma: I think we may be getting rain soon.

Betty: Actually, Norma, after analyzing the latest data, including local atmospheric pressure, temperature and cloud characteristics, and the velocity of fronts within a 100 mile radius, I conclude that we will NOT be getting rain soon.

Norma: Well, Betty. It sounds like, when you grow up, you might be quite the mee-tee--a-rol--o--gist.

Betty: Are you calling me FAT?

Norma: ????

Betty: You clearly know nothing about weather, and you try to overcome your ignorance by saying that when I grow up, I'll be a MEATY urologist. Ad hominem attacks have no place in rational discussions.

Norma: No, Betty. Your scientific knowledge actually impresses me. I said you were going to be quite the METEOROLOGIST when you grew up.

Betty: Oh, so I thought it was an ad hominem...

Norma: and it was really only an ad homonym!

(meterologist homonym courtesy of Richard Lederer)
by I. Wagner November 30, 2006
 
1.
Attacking someone's grammar/spelling in debate rather than focusing on their argument. An intentional play on the word "ad hominem".
Person A: I think you're argument is illogical. Here are several well-reasoned arguments why I think so.

Person B: It's "your", not "you're". I will now call you names like "illiterate imbecile" while completely ignoring the fact that you pwned me in reason and logic.

Person A: That's an ad homonym attack.
by mais March 20, 2013
 
2.
A misspelling of "ad hominem."
Ad homonym is a misspelling of the word, ad hominem.
by Just another fag October 22, 2010
 
4.
A logical fallacy used in an argument or debate. When someone attacks the person instead of the subject at hand, usually complete irrelevant and personal.
Guy: I think that the American internment camps for Japanese-Americans were justified.

Girl: How can you say that? Then the Americans aren't doing too much different than Germany with the Jews.

Guy: Yea well you're a slut.

Girl: That has nothing to do with the subject at hand, is your ad homonym attack a sign of you're ignorance and stupidity?
by Tuvi November 28, 2006