My boss called me "squirelly" today

I recently received a promotion at work (from provisional to permanent position). When my boss sat down with me to go over my performance he essentially said I meet or exceed expectations outside of how I carry myself. More specifically my level of confidence. He said I need to learn to get over myself and be comfortable with who I am. Then today in a sort of joking manner he pointed at me to other coworkers and said something along the lines of "we gotta be careful of squirely over here though". I sometimes feel like I'm borderline on the spectrum and don't always understand what people mean to convey. Is that a joke about me being an anxious person? Or does that have some other meaning?