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2.
When someone gets along very well with someone else. Applies to both sexes.
So how'd it go with Tanya boi?
- Dawg, I took her to dinner and we totally hit it off.
by Samson October 29, 2003
 
1.
goes really well with someone
by Bo Yang July 24, 2003
 
3.
When two people get along well or like each other right from the moment they meet.
Guy: "I heard that Alex and Emma met yesterday. Did they get along?"
Girl: "Yeah, they really hit it off."
by galagal February 26, 2012