- an odd, irrational, or unconventional person; wacko.
- a thing or things that are unsatisfactory, worthless, or of low quality: The show is mostly a lot of wack, with a couple of funny moments.
- extremely bad or inferior: The song is great, but the video is really wack.
- odd, irrational, or unconventional; wacky: I’m afraid the neighbors think we’re wack!
- extremely good: The guys scarfed down those wack cookies you made, and they're asking for more.
- friend; pal: used chiefly as a term of address
