In association football, a goal poacher is a type of forward

Striker

Forwards, also known as strikers, are the players on a team in association football who play nearest to the opposing team's goal, and are therefore principally responsible for scoring goals...

 primarily known for scoring ability and movement inside the penalty box.

Details

Most of these players rarely score from outside the penalty area, and are more well known for their close range finishes. They are generally good at poaching goals due to their excellent off the ball

Off the ball

Off the ball is a term used in football in the UK, usually associated with a players movement when not in possession of the football...

movement; this allows them to lose defenders and gain space to shoot. Many goal poachers have powerful and accurate shots and usually able to score with both their left foot, right foot and their head.