"darf's" is short for?
"Was darf's sein?"
I know it means "What are you going to have/eat/buy?" or "What would you like to have/eat/buy? "

But I'm wondering what is "darf's" here short for?

Question

"darf's" is short for?
"Was darf's sein?"
I know it means "What are you going to have/eat/buy?" or "What would you like to have/eat/buy? "

But I'm wondering what is "darf's" here short for?

Answer

The " 's " means "es", so the full sentence would be "Was darf es sein?".

Answer

Was darf's sein?=Was darf es sein?    
Dieser Satz ist sehr oft von Verkäuferinnen verwendet.