JACKASS
jack, jackass
(noun) male donkey
fathead, goof, goofball, bozo, jackass, goose, cuckoo, twat, zany
(noun) a man who is a stupid incompetent fool
Source: WordNet® 3.1
Etymology
Noun
jackass (plural jackasses)
a male donkey
Synonym: jack
(chiefly, US) a foolish or stupid person
Synonyms: fool, idiot, dink, dope, buffoon
(chiefly, US) an inappropriately rude or obnoxious person
Synonyms: jerk, asshole, bastard, bitch
Proper noun
jackass
(poker slang) a jack and an ace as a starting hand in Texas hold 'em due to phonetic similarity
Verb
jackass (third-person singular simple present jackasses, present participle jackassing, simple past and past participle jackassed)
(rare) to behave very obnoxiously
Source: Wiktionary
Jack"ass`, n. Etym: [2d jack + ass.]
1. The male ass; a donkey.
2. A conceited dolt; a perverse blockhead. Jackass bark (Naut.), a
three-masted vessel, with only the foremast square-rigged; a
barkentine.
– Jackass deer (Zoöl.), the koba.
– Jackass hare, Jackass rabbit (Zoöl.). See Jack rabbit, under 2d
Jack, n.
– Jackass penguin (Zoöl.), any species of penguin of the genus
Spheniscus, of which several are known. One species (S. demersus)
inhabits the islands near the Cape of Good Hope; another (S.
Magellanicus) is found at the Falkland Islands. They make a noise
like the braying of an ass; -- hence the name.
– Laughing jackass. (Zoöl.) See under Laughing.
Source: Webster’s Unabridged Dictionary 1913 Edition