Instead of walking on the side of the road trying to get a ride with your thumb out, The Polish Hitchhiker is the act of driving around picking up people on the side of the road with your dick hanging out of your pants.
Paul decided to be adventurous and help out some hitchhikers, by giving them the experience of a Polish Hitchhiker.
When your wife,girlfriend or significant other bends, over you sneak behind them. While they are bent over,go between their legs and using your hitchhiker thumb start from the crotch to the rear saying " Need a ride".
My wife got all excited because I gave her a Polish Hitchhiker when she wasn't expecting it.