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
Farlex Dictionary of Idioms.

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
The American Heritage® Dictionary of Idioms by Christine Ammer.

all that

Informal
To the degree expected.
See also: all, that
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • be all that
  • turn a phrase
  • brain surgeon
  • all fur coat and no knickers
  • fur
  • knickers
  • cheap at twice the price
  • has got game