fark · interjection1
An alteration of fuck, using a non‐rhotic ⟨ar⟩ to signify an elongated /ɐ/ or /ʌ/. The spelling has been used in works by Australian satirists since at least 1970.
fark · verb2
From the name of the popular website Fark, because when it links to a small website from its main page, the small site is often subjected to so much new traffic that it is rendered inoperable due to server failure.
Etymology from Wiktionary, CC BY-SA 4.0.