Definition:
"Wack" is a slang term that means something is bad, uncool, or boring.
Use case:
You can use "wack" to describe something that you don't like or find uninteresting. For example, if someone suggests watching a movie that you think is boring, you could say "That movie is wack, let's watch something else."
• I can't believe you're still hanging out with those wack friends of yours, they're bad news.
• I'm sorry, but your taste in music is wack.
• This sandwich is wack, it's all bread and no filling.
• I don't know why everyone is so into that TV show, it seems pretty wack to me.
• That movie was kind of wack, but at least the special effects were cool.
• The new album from that rapper is wack, it sounds like he's just phoning it in.