I’ve never heard “full ass” as an actual term anywhere, but I wondered about it since the actual term “half-ass” implies there should be a theoretical meaning for going full. If “half-ass” means insufficient work/performance, then would going full mean maximally sufficient? Or since “ass” is generally treated as bad, does going full mean maximally insufficient (i.e. 0% complete and/or worst-quality work)?

There’s a similar query, but its answers solely focus on “half-ass,” with passing mentions of a “full(y) ass” without pinning down a definitive direction.

  • 5
    You have whole-ass adjective , adverb US slang, complete or completely: It's not a snack; it's a whole-ass meal. dictionary.cambridge.org/dictionary/english/whole-ass
    – user 66974
    Mar 25, 2023 at 16:24
  • You can do whatever you want with this type of thing in English: full-assed, quarter-assed, whole-assed x. With or without the past participle form.
    – Lambie
    Mar 25, 2023 at 18:38
  • 1
    Now that I think about it, full ass ought to mean completely foolish. Perhaps John Lawler will come and say something about polarity. Mar 25, 2023 at 18:58

1 Answer 1


User "Archy Will He 何魏奇" explained it in an answer to that previous question:

According to the Online Etymology Dictionary, half-assed made its first appearance in the early 20th century. It is most likely a mispronunciation of the word haphazard.

half-assed (adj.)

"ineffectual," 1932, perhaps a humorous mispronunciation of haphazard.

With this in mind, I don't think full-assed or fully assed would make any sense. Though some people may probably still use it like how the word mentee is invented by adding a suffix after back-forming the word mentor. And that is rather ridiculous. Unlike professor or escalator, the word mentor is originated from the Greek word Méntōr which is the name of the son of Anchialus and Asopis.

As "user 66974," the backformation "whole-ass" exists; it means maximally sufficient, not maximally insufficient, as Cambridge explains.

  • False: “It is most likely a mispronunciation of the word haphazard.” Mar 26, 2023 at 0:02

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