Someone who you find attractive not because of their physical appearance but because of demeanor, skill in a particular area, or general badass-like qualities. A crush on a cool ass babe is less likely to develop as the result of sheer lust than out of a sense of incomperable awe when watching the things they do or the way they behave or what they're capable of creating.

Most geek babes are also cool ass babes - people you might not normally notice, until at some point you interact with them on a more than superficial level and are completely bowled over by their cool ass.

The only problem with cool ass babes is that sometimes they don't find you quite as amazing as you find them, and this tends to cause a very one-sided balance of respect in both platonic and non-platonic relationships.