Culture fit is more generally whether your personality is a mesh with everyone else's personality. It's typically a blanket over everything non-coding in an interview.
For example..
Positives:
* Person is a go getter, gets things done, doesn't get blocked
* Person is meticulous, pays careful attention to detail
* Person is a good communicator, articulating explanations eloquently
* Person stumbles around an incorrect solution until hints are given
* Person jumps to conclusion without considering the bigger picture (or the edge cases)
* Person doesn't seem to get it, or at least can't explain himself/herself well
And this can then be inferred from the technical "coding" question, or in more traditional companies they will ask direct questions (usually known as "behavioral" questions) that focus on just those personality traits.
To give a particular example, at Amazon the "culture fit" of a candidate is how well they adhere to the company's leadership principles: