Doable
What does it mean?
Quick summary: An informal word that can mean possible, and in some contexts, sexually attractive enough to sleep with.
Doable normally means possible or manageable. In sexual slang, however, it can describe a person the speaker would be willing to have sex with.
REAL ENGLISH.

Is it positive or negative?
The ordinary meaning is neutral. The sexual meaning is objectifying and often sounds crude.
When do you use it?
Context matters a lot. In normal English, it is harmless. About people, it can sound blunt and disrespectful.
Examples
Example 1: The project is tight, but still doable.
Example 2: Saying a person is doable sounds crude because it reduces them to sexual availability.
Question for you
Have you mostly heard doable in the harmless sense, or the sexual one?
Try saying your answer aloud, using the expression.
Practise it in a lesson
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