noun

• (often vulgar through confusion with other word) A stupid or jerky (inconsiderate, etc) person.
  "Near-synonyms: fool, idiot, jerk, asswipe; see also Thesaurus:jerk"
• (printing, slang, obsolete) A compositor.
  "Sometimes by way of joke, and sometimes by way of irritation, compositors are called Asses by the pressmen."

noun

• (countable and uncountable) The buttocks.
• (countable and uncountable) The anus.
  "Train compartment: two sick young junkies on their way to Lexington tear their pants down in convulsions of lust. One of them soaps his cock and works it up the other's ass with a corkscrew motion."
• (synecdochically, uncountable) Sex; a person to have sex with; with vulgar emphasis on their corporeality (their body) over their personhood.
  "I'm going to go down to the bar and try to get me some ass."
• (uncountable) Used in similes to express something bad or unpleasant.
  "I feel like ass today."

adj

• (vulgar, slang) Of low quality; bad.
  "On a recent episode of "The Justin Dunning Podcast," Starkel shared his thoughts on Martell, a former Ohio State quarterback, saying "he's ass my dude" in reference to Starkel."

noun

• (biochemistry) Initialism of argininosuccinate synthase.