Hula-Hoop
US /ˈhuːləˌhuːp/
UK /ˈhuːləˌhuːp/

1.
a toy hoop that is twirled around the body, especially the waist, by the motion of the hips
:
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She learned to keep the Hula-Hoop spinning for minutes.
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Kids were playing with Hula-Hoops in the park.
1.
to twirl a Hula-Hoop around one's body
:
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She can Hula-Hoop for hours without dropping it.
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They challenged each other to see who could Hula-Hoop the longest.