Table predator

Noun-

A person who aggressively scouts out tables and takes them as soon as a party gets up from their chairs in a restaurant setting; a person who cuts in front or other people walking towards an open table; a person who waits right next to a party eating just to take their table

I was going to that open table but a table predator cut right in front of me and stole it!
Or
I just saw that lady hip check that little kid; she's such a table predator!