Bowling ball noise in trunk
Have you removed the spare and all the other stuff under the cargo floor to see if that is the issue?
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More to the point, have you removed the bowling ball from the trunk? 
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This could be a serious suspension problem. Get the car to a shop ASAP.
Hitting the lane?
Making a strike?
Tester
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Your really do need to have a mechanic check this out. It could easily be serious enough to suddenly get a lot worse and cause you to lose control.
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It might help to provide more info as to year, miles, and so on. It could be benign such as a loose spare tire or something far more serious such as a bushing in a knuckle or trailing arm. Whatever the cause, it should not be difficult to sort out.
Remove everything in the trunk including the spare, the jack and luggage platform. Go for a ride and see how it goes. If the noise is still there, you have a problem.Look for loose exhaust ,heat shields and broken suspension parts. Report back
