An extremely long dump that is so large that the head pokes up out of the water in the toilet bowl, while the body remains submerged, much like photographs that claim to show the infamous Nessie.
The key difference between a floater and a LNM is that only the head shows on the water's surface with a LNM, whereas a floater's entire body floats on the surface.
I think I just sighted the Loch Ness Monster in the bathroom.
Dude, I just dropped a Loch Ness Monster in your shitter... where's your plunger?
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