One who does everthing for his associate under demand and receive no praises for his accomplishments. The pussy of the neighborhood, the one you sent to the store for a dutch and you didnt let him/her hit it when they got back. This phrase is mainly used after the task at hand is completed. It may have originated from the prison term "fresh fish/meat" both meaning the same thing.
1.A put down.
2.A self esteem destroyer.
3.Your personal bitches official tag./Personal slave.