по́хуй (Russian) comes from Ukrainian По, from Italian Po, from Latin Padus, from Lepontic Bodincus, from Proto-Indo-European bʰudʰmḗn, from Proto-Indo-European dʰewbʰ-, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.
Ancestry of “по́хуй”, step by step
по́хуй traces back through 3 separate lines of ancestry.