There are 2 definitions of wack in English:

wack1

Line breaks: wack

Entry from British & World English dictionary

noun

British informal
  • Used as a familiar term of address, chiefly in Liverpool: ‘Gorra light ’ave yer, wack?'

Origin

1960s: of unknown origin.

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Definition of wack in:

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody

There are 2 definitions of wack in English:

wack2

Syllabification: wack
informal , chiefly US

adjective

  • Bad; inferior: a wack radio station
    More example sentences
    • Besides, I was tired with these wack rappers claiming to be this and that.
    • He was planning to do his own reality show (not as wack as it sounds).
    • There was an attempted comeback, but it was wack.

noun

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  • 1A crazy or eccentric person.
    More example sentences
    • The whole thing is a mess of accusations of conspiracies and attempts to paint Curtis as a wild-eyed wack.
    • Malone was a complete wack and seemed to drive Rin over the edge!
    • Hardly any of those wacks running for office are worth voting for.
  • 2Worthless or stupid ideas, work, or talk; rubbish: this track is a load of wack
    More example sentences
    • Not because he thinks that 50 Cent's flow is mad wack, but because - in his opinion - 50 Cent glorifies gun crime.
    • Anyway, says Ghostface Killah about the Wu's new mission: ‘The game is mad wack…’
    • But thanks to the proliferation of hip-hop media, which spreads the word separating the wicked from the wack, self-criticism is slowly becoming a fixture as well.

Origin

1930s: probably a back-formation from wacky.

More definitions of wack

Definition of wack in:

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody