Rejection, tossed aside, not wanted, not needed, or expendable
Distasteful or undesirable
The idea of discovering a "diamond in the rough" or the attitude of "one person's trash is another one's treasure"
Picking through a junkyard can mean:
You're having to do something you really don't want to do in real life
You're feeling like you're getting someone else seconds or rejects, or are feeling second-best