Rear suspension/steering

I was driving about forty mph, and I went through a slight rain shower. Barely enough to get the road wet. My tires are fairly new, still have a lot of tread. From nowhere it felt like I hit a little slick spot (the back end fishtailed slightly towards drivers side) vehicle felt as it corrected back, then from nowhere it decided to do it again. Except this time instead of correcting, it spun the whole car around in the same direction as before. No I notice the rear driver side tire its straight like it should be. If you are facing the tire it would be leaning into you around the 10 o'clock position. Cannot find anything broke. Do not see anything that appears to be bent.