dibs

have dibs on something (American, informal)

to make it clear that something belongs to you or that you should be the next person to use something. I have dibs on the Sunday paper.

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(first) dibs on something

to have the right to do or get hold of something. I had first dibs on dessert and took the pie.

Usage notes: usually used with the verb get or as an interjection: Dibs on the ice cream!