Definition of "wack"

Ya'll are so wack.

2003 September 15, Michael Chapman; Matthew Chapman, “Teen Girl Squad Issue #4”, in Homestar Runner‎, spoken by Strong Bad as Cheerleader (Matthew Chapman)

The next day, Phonte gets in, and I let him hear the song, and he goes, 'This dude is wack, but what’s up with that beat though?' And I said, 'It's ours.'

2011 May 20, 9th Wonder (quoted), Jaeki Cho, “9th Wonder Tells All: The Stories Behind His Classic Records”, in Complex‎

When TMZ asked Bieber whether he can listen to The Weeknd’s music, the pop superstar replied, "Hell no I can’t listen to a Weeknd song. That shit's wack."

2017 January 23, Colin Stutz, “Justin Bieber Says He Can't Listen to The Weeknd's 'Wack' Music”, in Billboard‎

"No, no, no," James said Wednesday (via ESPN). "That's wack. That's wack. Why? You got to earn your spot to be in the postseason. No consolation for finishing last. That's corny. That’s corny. That's wack. To play for what? What are they playing for?"

2018 March 21, Des Bieler, “'That's wack': LeBron James doesn't like idea of NBA postseason play-in tournament”, in Washington Post‎

"He's so wack for that," Jeffryes said of Prescott. "As a black man you should want to speak out against police brutality and racial injustice. You have a black father. One day you will have black children."

2018 September 19, Chauncey Alcorn, “Dak Prescott takes heat from Dallas Nine protester after Cowboys game arrests: "He's so wack"”, in Mic‎

While it's not clear what the offending post was that resulted in removal, it is evident that he's not happy about the decision. "I'm done with Instagram this shit is wack,' he wrote.

2018 October 3, Joe Price, “50 Cent Quits Instagram Over Post Being Taken Down: 'I'm Done'”, in Complex‎

Or, just as likely: Bobby thinks that guy is wack and sucks at Fortnite, and he doesn't accept Ryland's friend request. Next game, he'll go for the shotgun.

2021 June 10, Cecilia D'Anastasio, “How Roblox Became a Playground for Virtual Fascists”, in Wired‎

[…] but if there's somebody out there that's like, 'Oh, his music is wack,' what they're really saying is he's wack... But he's like, 'I don't give a fuck 'cause this isn't even really me.'

2022 July 20, Logic (quoted), Joshua Espinoza, “Logic Says 6ix9ine Is One of Many Rappers Who Put Up a Facade: 'That's Not Really Who They Are'”, in Complex‎

A few well chosen words such as "Let's be having you wack!", works wonders. The dockers know that they've got a Scouse to deal with. I'm not saying that a Southerner couldn't handle the situation, but the job might well take longer.

1966, The British Journal of Photography, volume 113, H. Greenwood, page 17

Leading Seaman Hanlon, a tough young man from the Liverpool docks, greeted him with, 'Wot's up with you, wack? Lost yer bleeding maor summat?'

2011, Douglas Reeman, Torpedo Run, Random House

One of the young men stepped forward to explain. It was obviously an enthusiasm of his. 'Hey, Wack, gerron wiv it, eh?'

2019, Richard Woodman, Voyage East, Canelo