I don't hate slow drivers, I think they're taking their time cuz they need to.

My way to get tailgaters off my asphalt involves my truck's windshield washer fluid. If I'm being followed too closely, I start washing my windshield with a LOT of fluid and wipers going full blast. The car behind me will get misted and make a mess unless they back off. I don't know if this works at slow speed, but it works on the freeway. It's funny to see the expression on their face (rearview mirror) when their windshield starts getting cloudy, and they have to wash theirs, too.