Mount Saint Helens
A super intense ejaculation of sperm. An explosive orgasm, where hot sperm shoots out like a lava flow.
"  I met a really hot Geologist last night.  We were making out, and I got hard enough to cut diamonds.  I took her back to my place, and I explored her cave for awhile.  I totaly Mount Saint Helensed!  Holy Schist,She got my rocks off.  I had a gneiss time.