A knock-off of inferior quality, or something similar to something else, but not as good.
Mr. Ed is the poor man's John Kerry, since he has the same face but inferior public-speaking skills.
Jared was horrified when he remembered going home wasted with a Jessica Alba look-alike, then woke up the next morning naked next to the poor man's Rosie O'Donnell.
A copy made of anything popular,usually made by a rival
that is complete shit compared to the original
Poweraid is Poor man's gatoraid
snk's KING OF FIGHTERS is Poor man's CAPCOM STREET FIGHTER