What’s Up

As a Phrase (Informal Greeting)

1. A casual way to ask how someone is doing or what they are doing.
2. A way to start a conversation or check in with someone.
3. Can also express surprise or concern, depending on the tone.

As Other Form

• What’s Up? (Slang): Used interchangeably with “How’s it going?” or “What’s new?”

Word History

The phrase what’s up has been in use since the early 20th century. It became popular in American slang as a casual greeting, especially in the late 20th century, with cultural boosts from cartoons (like Bugs Bunny’s “What’s up, doc?”) and modern digital communication.

Examples

1. Hey, what’s up? (Greeting)
2. I saw your missed call—what’s up? (Checking in)
3. You look upset. What’s up? (Expressing concern)

Synonyms

How’s it going, what’s new, how are you, what’s happening

Related Words

Hey, sup, howdy, yo

Antonyms

(Not applicable, as it’s a casual greeting)