There is a movie from 1999 with the title <She’s All That> starring Rachael Leigh Cook . A very handsome high school boy meets an ugly girl and makes her queen, and falls in love with her. “She’s all that” means that she is very attractive and well dressed. You can assume that since she has everything she needs, she must be perfect! There are many expressions similar to this one – such as “hottie”, “knockout”, “da bomb”, etc.
Meaning: Someone who is “all that” is very attractive and sexy. She could be the center of everyone’s attention.
Let’s see when this expression can be used:
A: “Mary is all that. I’ve had a crush on her since the day I first saw her.”
B: “I feel for you, man. She’s really great. Why don’t you ask her out? There’s nothing to lose.”
A: “I don’t have the guts to do so.”