that's what's up
In real, traceable use. Part of the curated seed collection; community review is coming.
Sense 1
Meaning · English
Used to express acquiescence or concurrence; true; indeed.
Register: slang
Where it’s used:
Used
American English
Examples
I choose this particular terminology because of the frequency with which I heard it used either in describing a person (“she knows what's up”) or as a statement of approval in response to a particular thought or idea that was introduced (“that's what's up”)
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Sense 2
Meaning · English
Used other than figuratively or idiomatically: see that's, what's up.
Nghĩa · Tiếng Việt
Sử dụng ngoài nghĩa bóng hoặc thành ngữ: xem that's, what's up
Machine-translated — suggest a fix
Register: slang
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “that's what's up” mean?
Used to express acquiescence or concurrence; true; indeed.
Is “that's what's up” formal or informal?
that's what's up is generally slang.