i. When you are not sure if you will be able to do something or not.
ii. Something that could be a bit edgey.
i. Person 1 : "Hey are you coming out to get lashed tonight?"
Person 2 : "Hmmm, its going to have to be an amber light for me at the moment, I have lots of work to do and a presentation to prepare for tomorrow."
ii. Person 1 : "Man alive, how hot is that girl?"
Person 2 : "She's getting an amber light from me at the moment, she could be a bush pig but is too far away to tell."