The story
- Hindustani · calque of
- English todayunclefucker
Compound of uncle + fucker, by analogy with motherfucker. Calque of Hindustani خَالُو چود (xālū cod) / ख़ालूचोद (xālūcod). Popularised by the song "Uncle Fucka" in South Park: Bigger, Longer, Uncut, a 1999 American adult-animated comedy film.
Etymology from Wiktionary, CC BY-SA 4.0.