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1.
The results of too much beer, White Castles, and vallium.
I drank too much beer and had too many Whitey's last night, and now I have the volcanic shits.
by shit admin August 12, 2008
 
2.
When you're constipated and a fart builds up above the stuck shut, creating more and more pressure. The end result is a painful explosion of shit scattered around your toilet basin.
Argh, my ass hurts so much after that Volcanic Shit I had.
by Archaeon December 29, 2012