I can hear a sloshing sound in the petrol tank of my 2002 AU III Falcon when I manoeuvre the car. It suggests that there are no baffle plates in the petrol tank; is it compulsory for car manufacturers to fit baffles to stop the uneven movement of petrol? On one occasion on a damp road I traveled through a roundabout at a safe speed when the rear of the car suddenly did two 180-degree spins.
It's most unusual to be able to hear petrol sloshing around in the tank; most tanks have baffles to stop it, and yours should have. I would doubt very much, however, that sloshing petrol caused your spins. The most likely cause is a greasy road, low tyre tread, too much speed or too much throttle.
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