What is the slang definition of squid?

"Squid" doesn't have a widely recognized slang definition. It's mainly used to refer to the actual cephalopod creature. However, there are a few instances where it might be used more casually:

* Squid ink: Sometimes used as slang for "black coffee" due to its dark color.

* Squid game: This refers to the popular South Korean Netflix series, but it's not necessarily slang.

* Squid as an insult: In some online communities, "squid" might be used as a derogatory term for someone who's considered weak or incompetent. This usage is relatively niche and might not be universally understood.

Overall, "squid" is not commonly used as slang. If you hear someone use it in an unusual way, it's best to ask for clarification.