Esterhuysen used the word "fuck" repeatedly in a 01:00 broadcast.
EWN editor Katy Katopodis said he had been summarily dismissed.
Although she had been unable to reach Esterhuysen by phone, a letter of dismissal had been delivered to his house.
"We can't tolerate that kind of behaviour. I don't think it's appropriate to use our platform, which is credible, to promote your own agenda," she said.
A 41-second clip, purportedly of the broadcast, on the website twitvid.com had garnered 35 000 views by Tuesday afternoon.
In it a man who identifies himself as Mark Esterhuysen, says: "Fuck racism, fuck the pigs who killed Andries Tatane, fuck the AWB, fuck racism. We are all wild animals here, meant to live free.
"Fuck capitalism, fuck fascism. Fuck this fucking wage slavery shit. Fuck domestication, fuck Julius Malema, fuck the state. Fuck the petrol economic growth on a finite planet."
On his Twitter feed, he identified himself as an enemy of the state, a defender of anarchy, a proud member of the primate clan, a cunning linguist, and a master debater.
He had tweeted that all he wanted in life "is for @GarethCliff to read my blog".
His most recent blog was on the role of sport in modern South Africa, from an anarchist perspective.
Other topics dealt with the futility of civilisation.
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New music video!
Great gig pics!
Watch it here!
See the line-up!
All his gigs!
Pretoria EastCapital GrowthR1 500 - R4 000 Per Week
Pretoria NorthCapital GrowthR1 500 - R4 000 Per Week
PretoriaWise Choice RecruitmentR25 000 - R30 000 Per Month
HousesR 1 950 000
Apartments / FlatsR 880 000
TownhousesR 929 000