One who must compulsively handle or touch every item when entering a retail establishment, never with an intent to purchase the merchandise.
1. The proprieter of the local "Sunglass Hut" hated Barbara, as she was a known fingerfucker and would smudge all the lenses of the Prada eyewear and leave without spending a dime.
2. Retail managers hate fingerfuckers who take up sales clerk time, put their hands on everything, and then walk out.