When you have the makings of a very large dump pushing into the rectum area, causing tension and potentially a deformation of the area. Similar to the creation of the lava dome on Mt. Saint Helens due to magma pushing to the surface.
Guy 1 - "Hey where you going in such a rush?"
Guy 2 - "I've got a severe lava dome growing here, I'll be back in 15 minutes."
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It is when you give head with a mouth full of hot sauce, causing an immense searing burn to the genital region.
Michele gave Jesus lava dome with Mad Dog Hot Sauce.
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