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Language is constantly evolving, and nowhere is this more apparent than in the lexicon of Gen Z. As the first generation to grow up fully immersed in social media, their language is influenced by memes, viral videos, and digital culture. With 2025 underway, several Gen Z slang terms have already become ubiquitous, appearing in everyday conversations, on social media platforms, and even in mainstream media. Here are 11 slang terms that have already peaked this year.

1. Delulu

"Delulu," short for "delusional," is one of the most prominent slang terms of 2025. It’s used to describe someone who holds unrealistic beliefs or makes outlandish claims. The term was catapulted into the spotlight after Australian Prime Minister Anthony Albanese used it in Parliament to describe his political opponents, referring to them as being "delulu with no solulu," which translates to "delusional with no solution." The term has since been widely adopted by young people, particularly in online communities. It’s now frequently used to poke fun at someone’s exaggerated or disconnected views on social media.