Ass Spelunking

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.

an individual who explores the anal passageways of another, through use of a tool such as a dildo or a penis. derived from ass, the anal region of the human body, while spelunking is cave exploring, thus the act of exploring the cavities of ones asshole. also used to describe a homosexual.

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.

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.

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.

to eat someones ass

One man who enjoys hopping and leaping atop another man's ass for long periods of time.