A word or phrase used in informal conversation is?

There isn't one single word or phrase that perfectly captures all informal conversation. But here are some possibilities, depending on what aspect of informal speech you want to emphasize:

General Informality:

* Slang: Words or phrases specific to a particular group or context. (e.g., "chill," "hangry," "lit")

* Colloquialisms: Informal expressions used in everyday speech. (e.g., "gonna," "wanna," "y'all")

* Idioms: Figurative expressions with a meaning different from the literal words. (e.g., "kick the bucket," "spill the beans")

Other Aspects:

* Jargon: Specialized vocabulary used by a particular profession or group.

* Vulgarity: Crude or offensive language.

* Humorous language: Jokes, puns, and playful banter.

* Conversational fillers: Words or phrases used to fill pauses or connect ideas. (e.g., "like," "you know," "um")

The best word or phrase depends on the specific context and the type of informal conversation you are describing.