Green’s Dictionary of Slang

(US Und.) a crime worth committing; somewhere worth robbing.

1937		E. Anderson Thieves Like Us (1999) 135: This bank here is a bird’s-nest on the ground.
1969		‘Iceberg Slim’ Pimp 246: Our first mark is a bird’s nest on the ground.
1996		E. Bunker Dog Eat Dog 26: Such things [i.e. arson] were gifts. What would Troy say? ‘A bird’s nest on the ground’ [ibid.] 165: It was so easy that Troy felt none of the usual fear at the start of a caper. It was easy, a bird’s nest on the ground.