An ass is somebody's bottom or more specifically in this case an anus.
A spelunker is an unexperienced person who has an interest in entering or enters caves.
Therefore, an Ass Spelunker is somebody who has an interest in exploring or does explore the cave-like orifice of an anus.
In South Park Terrance and Phillip call eachother Ass Spelunkers.
You love to fuck suzie in the butt, you ass spelunker!!!
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the art of giving a guy oral intercourse and deepthroating his cock to the point where it causes the person to upchuck on said cock. after which the man proceeds to anally penetrate the person using the fresh puke as lubrication.
zach likes giving swedish men swedish spelunkers in sweden on swedish holidays.
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A prank played on someone who is sleeping. When you pull down your pants stick their nose in your crack and then fart. May cause nosebleeds and/or loss of consciousness.
John was the first one to fall asleep, so Manuel sent him ass spelunking. Man was he pissed.
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Diving, tongue first, into the depths of a girl's asshole.
Being bored with normal cunnilingus, John decided to go spelunking.
When John's girlfriend recoiled in surprise, he had to stifle his laughter as he showed her how nice going spelunking could be.
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i went ass-spelunking last night in your girlfriends ass
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One man who enjoys hopping and leaping atop another man's ass for long periods of time.
Eat penguin shit, you ass-spelunkers.
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The act of opening and expanding the anal cavity of ones partner and then proceeding, with cave diving gear (ie: Carabiner, ropes, headlamps, etc), and entering the damp ridged caves of your consenting adult. Occasionally returning to the surface for air.
"Bro, I spent 3 hours ass spelunking last night."
"Oh yeah?, where at"
"Devons"