“It's all yours.”
You were in a restaurant bathroom, and someone knocked on the door to get in. Now you've finished and you're leaving the bathroom. You say this to the person waiting outside.
It's all yours.
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You say "It's all yours" when you're finished using something and want to tell the next person that they can use it:
A: Hey, are you done with that?
B: Sure, it's all yours.
You can also use this phrase when you're almost finished using something. For example, if someone in your family wants to use your computer, you can say:
Let me just do a few more things, and then it's all yours.
"It's all yours" is friendly and casual.