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2.
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.
by John Basedow Jr. March 25, 2009
 
1.
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."
by J November 01, 2004