In-group talk continually invents fresh labels. Slang is highly informal, often short-lived vocabulary and usage that mark belonging to a social group and flout formal norms.

Slang thrives among youth, subcultures, and online communities. It turns over rapidly; yesterday’s edgy term becomes today’s dated marker. Some slang items climb into colloquial standard use while others vanish.

Lexicographers track slang with dated citations. Sociolinguists treat it as a resource for identity and boundary maintenance. Outsiders who use slang inaccurately risk sounding forced or insensitive to group norms.

• Informal, often ephemeral group vocabulary
• Signals identity and solidarity
• Changes quickly across cohorts
• Occasionally enters mainstream usage