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One who explores the deepest,darkest recesses of someone's crap cave.
As I went butt spelunking in Suzy, I think I shot a wad into her upper intestinal tract.
by rev. ray April 08, 2004
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A person or persons who enjoy exploring another persons anal cavity
Thomas and robert are experienced butt-spelunkers, every day they enthusiastically explore eachothers anal cavities with many tricks and techniques!
via giphy
by RandomPlatypus June 15, 2018
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