This version of the ad hominem fallacy is pretty self-explanatory. When a person is attacked with abusive namecalling, it is his/her ethos that is being targeted, not the logic of his/her premise. Using this type of fallacy can make the attacker look immature, unfocused, and desperate to the educated audience. That said, in an emotionally charged argument, it can further charge those who already support the abuser and, in some instances, can sway the uneducated portion of the audience.
Example: You disagree with Mr. Spagnolo? Well, you're a dum-dum, so you couldn't possibly have anything sensible to argue. You smell funny, too.
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