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English word half-ass comes from English ass, English -assed ((slang, vulgar) Adjective intensifier.)
ass (English)
(slang) One's self or person, chiefly their body.. (slang) Used in similes to express something bad or unpleasant.. (vulgar, slang) Used after an adjective to indicate extremes or excessiveness.. (vulgar, slang) anus. (vulgar, slang) buttocks. (vulgar, slang, uncountable) sex.
-assed (English)
(slang, vulgar) Adjective intensifier.
half ass (English)
The onager.