Icing is when a team shoots the puck from it's defensive zone to behind the goal line in the other team's defensive zone and one of the other team's skater's touches the puck before one of the team that shot the puck's does. Therefore, an icing warning is when the puck goes beyond the goal line but an opposing player has not yet touched the puck.
Sources-
I play hockey! :)
Chat with our AI personalities