When a girl is naked and asleep under the covers and you get a flashlight (or a cell phone will do) and check out the goods. Usually done when you first sleep with someone, but can be done with girlfriends, friends, whatever.
A girl can perform this on a sleeping dude as well.
Laying there next to his hot one night stand, the perv grabs his cell phone and goes spelunking to get a closer look at her love clam.
by Crunchyness June 01, 2009

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When having sexual intercourse with a virgin or a girl that has not banged anyone that you know
When your at a party talking to your friends and a hot chick walks over that you want to have sex with. Use the term spelunking to make it seem like your not a perve. Just say hey man I want to go spelunking
by One crazy week September 12, 2011

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Having sexual intercourse with a girl who has a very wide and stretched out vagina. The vagina is very cave-like due to its constant past use. If you are considered to be spelunking, then the girl is a whore, and you will most likely contract a sexually transmitted disease.
I only had to pay five dollars to go spelunking in your mom
by pcdkchar November 22, 2010

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Lifting weights with ones penis.
I am a world champion spelunker, I can lift 287 pounds with my penis, I am amazing at spelunking.
by greenwhite55 September 09, 2011

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To lift things (typically heavy things) with ones dick
Tom went spelunking will Jill yesterday, he has some very strong parts
by Iamtheother September 10, 2011

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rifling through something in order to find something far greater hidden at the bottom.

can be a sexual reference...

enid spelunks jovially each night...

he was spelunking at great speed through the cereal packet to find the toy at the bottom.

he spelunked through the garbage for the cheese he left there.
by aneuryism March 22, 2007

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the sound your dead lifeless body makes when it lands in the bottom of a large chasm in a pitch-black cave you thought was cool to check out
The medical examiner explained the body was found in the chasm of a cave no doubt the deceased was spelunking...poor bastard
by boglin78 August 23, 2004

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