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English word fuckass comes from English f, English -ass
f (English)
(music) The name of the fourth tone of the model scale, or scale of C. F sharp (F♯) is a tone intermediate between F and G. (euphemistic) fuck. (printing) Folio, paper and book size (10"-12.5" x 15"-20") The ordinal number sixth, derived from this letter of the English alphabet, called ef and written in the Latin script.
-ass (English)
(North America, slang, vulgar) Converts an adjective into a noun having the meaning of, "one who is [adj.]".. (North America, slang, vulgar) Intensifies an adjective.
fuckass (English)
(vulgar, derogatory) A despicable person.