What is She's All That?
1.
Usually indicates a desirable woman who is beautiful plus capable or attractive in other ways- independent, strong willed etc.
Usually combined with a secondary inclusion of something considered to be pleasant or necessary to the speaker and often absurd for comic effect.
She's all that AND a box of smarties...
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The insult can be used instead of cunt to lessen the impact of the insult, and can sometimes be used in an affectionate manner. i.e.
Haw, ..