easy pickings
A prisoner who’s so weak, they let other prisoners steal their snacks and just take it without even fighting back. They get picked on like a soft piece of cake.
That new guy in the jail is an easy pickings. I stole his snacks and he didn’t even fight me.
The commissary guy is a total easy pickings. I took his candy and he didn’t say a word.
That kid in the cellblock is an easy pickings. I took his chips and he didn’t even look at me.