Yes, literally. But it's not hot or anything. Just steam. Colorless water vapor.

I lived there for a brief time when I first arrived here. I'll be there in about...a minute. All right?

[She doesn't wait for an answer, just hangs up and apparates to the hallway outside her old apartment. It doesn't take her long to find Karkat's place, and she knocks on the door, fairly close to sixty seconds after she hung up with him.]