If a dumpster says "empty when full" which one is it?

Is it full or empty when it's full and us it empty or full when it's empty, I'm confused. Does it change depending on whether you look in the dumpster or keep it closed.
If a dumpster says empty when full which one is it?
It's empty
It's full
It's both empty and full
I like cats
Select gender and age to cast your vote:
If a dumpster says "empty when full" which one is it?
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