Big Question

I drive a 2006 Toyota Tacoma with the manly 2.7 Inline 4. This truck is bone stock but when I am turning at a relatively tight corner at 55+ MPH I get this feeling in my chest about the rear axle. It feels like when you're bending a pencil slowly till it snaps. so when I am turning this snap does accrue there rear of the truck shoots out 5-10 degrees with a lot of force the stops instantly causing the vehicle to roll and it will stay like that till I stop turning. I am turning smoothy and my foot is not on the throttle. If anyone knows why let me know.