A former well known actor or director who at one point in their career achieved respectable success but, for some God forsaken reason, has been unable to recapture any of their former glory and continues to make bad movies. It gets to the point that you are fairly confident by the preview the movie will not be worth a rental. Box Office Poison recipients usually tie directly into the Razzie awards.
Handful of Box Office Poison Members:
Kevin Costner (lifetime achievement)
M. Night Shamalayan