Tom Tiddler's ground

1 :  a game in which a player designated Tom Tiddler or Tommy Tiddler tries to catch the other players who invade the area designated as his property

2 :  a place (as a no-man's-land) where pickings may be sought or had without effective interference this country was a Tom Tiddler's ground of raiding parties — T. E. Lawrence the border now became a sort of Tom Tiddler's ground filled with warring Kaffirs — Stuart Cloete