A legitimate or supposed right to demand something as one's rightful due
If you do this, you can be one of the first shoppers to have first dibs on sale items.
Recorded in 1939, I think he certainly gets first dibs.
I was going to sell it, but if you're interested, you can have first dibs on it.
Then I realized that doctors had taken first dibs on that pledge, so I came up with another one: Be original.
A surprisingly large crowd of fellow early risers was up for first dibs on the freshly groomed runs.