baggsy
To unofficially reserve something for yourself.
Steve: Hi Bob. Dave and I are going back to mine to watch a movie and drink some beers. Do you want to come?
Bob: Yeah, sounds good. Baggsy the sofa.
Dave: Too late, Steve already baggsied it.
Bob: Yeah, sounds good. Baggsy the sofa.
Dave: Too late, Steve already baggsied it.