It stands for "OnlyFans" a website originally for creators to engage directly with their audiences but quickly became a website where women sold explicit pictures of themselves to subscribers.

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sebzim4500 2 hours ago | parent [-]

TIL it wasn't created to be a porn site

	▲	bena an hour ago \| parent [-]
		They still run ads trying to push the narrative that it's for comedians and musicians. But at this point, OnlyFans is so synonymous with egirls that suggesting someone has an account is used as a way to insinuate they sell pictures of themselves.