Like dwarf tossing.

Actually the way it works is people drop people/children over walls INTO the US, to my knowledge no one from the US is dropping children back into Mexico, SA.

In Europe we have "throw your child overboard." Does that count? https://newmail-ng.com/a-young-drowned-migrant-child-washed-ashore-as-migrant-crisis-escalates-across-europe/ Of course, the lefties decried the horror and their solution was more migration.