Mystery swirl 

The random spluge-stain you see under a UV light (generally on a motel bed).

Brendan: "We stayed at the cheapest motel; it had a mystery swirl on the bed!"

Mystery swirl by afaraci12099 August 17, 2016

2 flavored mystery swirl 

When a man eats a womens vagina out and then bring the cum from the vagina to the anus and gives the girl a rim job, thus creating two flavors, that of the cum, and that of the rectum.

Last night i was eating out my girlfriend and my tongue slipped to her ass hole and i totally gave her a 2 flavored mystery swirl.

2 flavored mystery swirl by jajajabalaba May 24, 2010