1) One who engages in the practice of exploring the anus and rectal passage of another, just as a spelunker enjoys exploring dark, dank, underground passages.
2) A person who acts as though he might enjoy the practice of ass spelunking.
1) Man that guy is an ass spelunker. I think I saw him in the Gay Pride Parade last week.

2) Goddamnit Jimmy, stop prancing around like a fucking ass spelunker.
by Ragefist November 18, 2002
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Another name for a dick/cock. In particular after having had sex in a wet pussy or ass.

Derived from the concept of exploring a dark cave which is usually very wet as can be seen with a pussy and ass after lube is applied.
The wet spelunker bulging in Davids pants was making it hard for Taylor to concentrate.
by Kittyslyfox December 3, 2020
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The expansive exploration of the anal cavity taken to an extent far beyond typical examination. In order to be considered an ass spelunking specific symptoms must be present. Extreme pain, euphoria, nausea, loose stool, and loss of bowel control are typical. In order to be an ass spelunker one must have partaken in at least 75% of the anal event and have documented the such thoroughly. Any accomplice in the even is referred to as the secondary spelunker.
Many times ass spelunking is used in reference to homosexual acts, however, ass spelunking can also refer to those of hetero origin.
"That butt pirate goes ass spelunking nightly."

"Tuesday I went ass spelunking with Ashley and ruined her parents sheets. After she passed out a I gave her a superman."

by H. J. B. May 17, 2008
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Upon giving oral sex to a woman, the partner performing oral sex opens the vagina and yells "Hello, in there," or something of that sort, in hopes of hearing an echo.
John: Mary is such a slut, You could go vaginal spelunking!
by Chip J June 11, 2007
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A man who invites his wang into a woman's anus with authorization. He is then exploring a dirty cave. At a boy.
I plowed Rachele's ass. I was a dirty spelunker last evening.
by Naughty Naughty November 18, 2004
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