One who takes advantage of free samples at any given opportunity, regardless of the sample's usefulness to them.
The act of being a sample whore. Sample whoring.
Out of cologne and already tardy for his date, the sample whore decided to swing by Macy's to freshen up from the sample bottles they have there.
"That man's been in this store for about an hour, but his cart is practically empty. He must be sample whoring."