The effect given when a female's tights or stockings apply pressure on the skin at random places, which change as she walks, giving a lava lamp effect.
"Wow, look at the lava lamps on her!"
This is for those people on the "Alli" diet. If you consume too much fatty foods, then when you take a crap, the water will have lots of orange blobs floating on top of the water, resembling a lava lamp.
Dammit, that pizza gave me severe Lava Lamps!