It's called spelunking you dip shit.
When you add words to urban dictionary like sperlunking, you should make sure you got it spelled correctly moron.
by Rick V July 10, 2008
The act of exploring a cave, or caves for entertainment. Often referred to as "Cave Diving"
I am going sperlunking next week in some remote areas.
by Philip Thrasher August 26, 2006