To pick up an item that is not yours and look at it or examine it. Possibly to handle and examine an item without thinking of buying it. This word maybe a racist word. I don't know. But the word "coon" is a racist word meaning African-American people. I don't know if coonfinger refers to African-Americans in any sort of way.
I make about $34,000 a year. Me and my friend went into a Watch store. We could't afford any of the $50,000 watches, so we decided to coonfinger the watches just for fun.