Where does “pigfucking” come from?

pigfucking (English) comes from English Fucking, from English -ing, from Old English -ing, from Old English -tūn, from Old English tūn, from Proto-West Germanic tūn, from Proto-Germanic tūną, from Gaulish dunum — smoke; mist, haze.

Ancestry of “pigfucking”, step by step

pigfucking traces back through two separate lines of ancestry.

via English Fucking

StepLanguageWordMeaning
1EnglishFuckingAn act of sexual intercourse, especially one lacking passion or a feeling of sincere love
2English-ingUsed to form gerunds, a type of verbal nouns,...
3Old English-ingForming nouns from verbs, indicating action,...
4Old English-tūnhomestead, village, town
5Old Englishtūnenclosure, yard; place; dwelling
6Proto-West Germanictūnfence
7Proto-Germanictūnąfence; enclosure
8Gaulishdunumfort; hill, hillfort
9Proto-Celticdūnomstronghold, rampart
10Proto-Indo-Europeandʰewh₂-smoke; mist, haze

via English pig

StepLanguageWordMeaning
1EnglishpigAny of several intelligent mammalian species of...
2Middle EnglishpiggeA piglet or young pig; A pig irrespective of age;...
3Old Englishpicgaa young pig; piglet
4Proto-West Germanicpiggōpig
Every word from Proto-Indo-European dʰewh₂-Every word from Proto-Celtic dūnomEvery word from English -ing