Wack definition by Slang.net
This page explains what the slang term "Wack" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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When something is really strange, crazy, annoying, or awful, you might describe it as "wack." For example, if a company doesn't honor the warranty for its product, you may exclaim, "This is wack!" while hanging up the phone.
Wack is short for "wacked out" and "wacky," and was popularized in the 1990s. People often used it like a catchphrase with an emphasis on the "wack." For example, your friend may say, "That's just wack, man" when you said you can no longer make it to his wedding.