playing "hookey"

Yesterday my grandpa stopped over for lunch. He asked Ella where Collin was. She said "at school". Somehow they ended up talking about Collin missing school, and my dad asked Ella "if Collin had ever played hookey"? She said, "yeah". We asked her if she knew what that meant and she said, "yeah he does that all the time on the ice with his stick"! It was pretty funny!