Kiss something goodbye
Definition 1 of 1
Pro Tip 1/3Metaphorical Loss
Often used metaphorically to express losing chance or opportunity, not always a physical object. 
Missing these classes means you can kiss good grades goodbye.
Pro Tip 2/3Emotional Impact
Carries an emotional weight, indicating disappointment or resignation about the loss. 
After the storm, we could kiss our beach vacation goodbye.
Pro Tip 3/3Informal
It's casual language, better for conversations than formal writing. 
If the team loses this game, they can kiss the playoffs goodbye.