Phumlani Dube, who has a slot on the flagship breakfast and drive-time shows on Ukhozi FM - listed as the country's most popular station, with more than six million listeners - launched the attack on his Facebook page this week.
His outburst came after Buhle Mnguni - a Facebook "friend", although Dube claims not to know her - called the presenter a "fat pig".
The spat started when Dube, also a budding fashion-label owner, updated his Facebook status by calling himself the next Sean John after the label owned by US rapper Sean "Diddy" Combs.
Mnguni commented online: "Listen here you fat pig, you are not P. Diddy and never will be."
Dube hit back: "Your mother is a fat pig. You must read carefully before you comment, you slut. I didn't say I'm P. Diddy. I will humiliate and kick you. You think you are showing off, you whore? Who are you? What do you have? "
Responding to suggestions on the site that he knew Mnguni, he wrote: "I don't know this dog."
Dube has since deleted the offensive comments and removed Mnguni from his "friends" list. On Friday Dube expressed remorse.
"My reaction was in the heat of the moment and was completely out of character. I was just frustrated at having received unwarranted criticism from this young lady ... I felt humiliated and very upset. Just because some of us are public figures that does not mean that we have super powers. We are allowed to make mistakes just like every other non-perfect human being."
Mnguni told the Sunday Times: "I don't care what he says about me. I don't like people like him, always thinking they are better than others. As far as I'm concerned, he can go to hell."
SABC spokesman Kaizer Kganyago said it was a "private matter" that did not concern the broadcaster.
Media analyst Arthur Goldstuck disagreed: "If public personalities behave inappropriately in a social networking environment, it is equivalent to doing the same in public and the same consequences will apply.
"While a social network is a natural extension of anyone's ego, when it becomes part of celebrity ego and you believe you have an adoring audience who can find no wrong in you, then you are flirting with both your fans and with disaster."
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killer-punch!