be all that

be all that

To be remarkably adept, intelligent, good-looking, or successful. Primarily heard in US, South Africa. I don't need to see his test results, I already know he's all that!
See also: all, that

all that

1. Too, very, usually employed in a negative context meaning not too, not very. For example, The new house is not all that different from your old one. [Mid-1900s] Also see none too.
2. That and everything else of the kind. For example, She enjoys wearing nice clothes and perfume and all that. [c. 1700] Also see and all.
3. See for all that.
See also: all, that

be all that

AMERICAN, INFORMAL
If someone or something is all that, they are very impressive and of a high quality. My boyfriend thinks he's all that. I read the book because my friend thinks it's all that.
See also: all, that

be all that

be very attractive or good. US informal
2002 Guardian I can't believe how she throws herself at guys, she thinks she's all that.
See also: all, that

be all ˈthat

(American English, informal) be very attractive or impressive: He thinks he’s all that.
See also: all, that

all that

Informal
To the degree expected.
See also: all, that