Double Dibs
Calling dibs on something and thereby forfeiting it because the caller already had dibs.
"I get to drive the stretch from calgary to vancouver, dibs!"
But the caller had already had dibs on it from a previous time. Revoking the dibs on the "Double Dibs" policy
But the caller had already had dibs on it from a previous time. Revoking the dibs on the "Double Dibs" policy