slow blink

A KITTY KISS IS A SLOW BLINK

My friend, Fran and I exited my car in front of my house.  She had never met my cat, Tigger.  He was sitting in the front window watching us.  I told her that sometimes Tigger could be shy.  She replied:  “Oh, we will be fine.  He just gave me a slow blink and I gave him one back.”  I was baffled.  I had cats all of my adult life and had never heard of that.