When a woman uses her mouth, her vagina, and anus (back door) in one sexual encounter.
Suzy started out giving me an amazing blowjob and next thing you know she is doggie begging for it in her vagina. A few minutes in Suzy says hey baby lets make this a roundabout and you enter in to my back door
by 58jomo July 14, 2022
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A small, improvised trip in an often, unknown city or town.

Could also be a walk around something, such as the block or a park.
I'm going for a roundabout in Brisbane this weekend.

I'm taking the dog for a roundabout in the park.
by TrudySharknose May 23, 2019
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when a group of men (usually in a group of six or more) all have anal intercourse with one another all lined up in a circle.
The roundabout only finishes when all men participating have climaxed, becuase of this, Cock and ball roundabouts often need a safeword.
''these guys are pretty intense, i heard one time they did a Cock and ball roundabout''
by frog spider in mouth August 21, 2019
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