It's when you put toilet paper in a toilet bowl before defecating so that the feces float and achieve full throttle air contact so that the smell may stench the whole area. This phenomenon is commonly practised after bad hotel service.
Dude I left a floating island of reprisal at the Hotel! Dude the floating island of reprisal stenched the whole room!
The nefarious process of creating a commode-filling, toilet tissue supported, shit-flotilla in an attempt to air-expose as much fecal material as possible, thus maximizing both odor and offence for subsequent, unsuspecting patrons; frequently deployed in the bathroom facilities of restaurants with poor service, gas stations with exceedingly foul rest room hygiene and other locations deserving of passive-aggressive retribution.
That restaurant had the worse service ever and the food was terrible; there'll be no courtesy flush for them; Foul Floating Filth coming right up...I've been eatin' corn and burritos , too...