There are 2 main definitions of wack in English:

wack1

Line breaks: wack

noun

British informal
Used as a familiar term of address, chiefly in Liverpool: ‘Gorra lightave yer, wack?'
More example sentences
  • Eh, ta very much wack.

Origin

1960s: of unknown origin.

Definition of wack in:

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There are 2 main definitions of wack in English:

wack2

Line breaks: wack
informal , chiefly US

noun

1A crazy or eccentric person: the kids were learning to live with the idea that Dad was a wack
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.
2 [mass noun] Worthless or stupid ideas 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.

adjective

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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.

Origin

1930s: probably a back-formation from wacky.

Definition of wack in: